Editing ANSI escape code (section)

=== {{anchor|colors}}  Colors ===

==== 3-bit and 4-bit ====

The original specification only had 8 colors, and just gave them names. The SGR parameters 30–37 selected the foreground color, while 40–47 selected the background. Quite a few terminals implemented "bold" (SGR code 1) as a brighter color rather than a different font, thus providing 8 additional foreground colors. Usually you could not get these as background colors, though sometimes inverse video (SGR code 7) would allow that. Examples: to get black letters on white background use {{code|ESC[30;47m}}, to get red use {{code|ESC[31m}}, to get bright red use {{code|ESC[1;31m}}. To reset colors to their defaults, use {{code|ESC[39;49m}} (not supported on some terminals), or reset all attributes with {{code|ESC[0m}}. Later terminals added the ability to directly specify the "bright" colors with 90–97 and 100–107.

The chart below shows a few examples of how VGA standard and modern [[terminal emulator]]s translate the 4-bit color codes into 24-bit color codes.

<div style="display: flex; width: 100%; overflow-x: auto">
{| class="wikitable"
|-
! {{abbr|FG|Foreground}}
! {{abbr|BG|Background}}
! Name
! VGA{{ efn | Typical colors that are used when booting PCs and leaving them in text mode, which used a 16-entry color table. The colors are different in the EGA/VGA graphic modes. }}
! [[Windows Console|Windows&nbsp;XP<br/>Console]]{{ efn | Seen in Windows XP through Windows 8.1 }}
! [[Windows PowerShell|Windows<br/>PowerShell&<br/>1.0–6.0]]{{ efn | PowerShell's default shortcut [[.lnk]], unchanged for over a decade, remaps yellow and magenta to give PowerShell distinctive foreground/background colors compared to the Command Prompt.<ref>{{Cite web |title=default shortcut on Windows remaps ANSI colors 35,36 · Issue #4266 · PowerShell/PowerShell |url=https://github.com/PowerShell/PowerShell/issues/4266 |access-date=2022-12-21 |website=GitHub |language=en}}</ref> PowerShell&nbsp;7 is unaffected.}}
! [[Visual Studio Code]]{{efn|Debug console, "Dark+" theme}}
! [[Windows Console|Windows&nbsp;10<br/>Console]]{{efn | Campbell theme, used as of Windows 10 version 1709.}}
! [[Terminal (macOS)|Terminal.app]]
! [[PuTTY]]
! [[mIRC]]
! [[xterm]]
! [[Ubuntu (operating system)|Ubuntu]]{{efn | For virtual terminals, from /etc/vtrgb.}}
!Eclipse Terminal
|-
| {{tt|30}} || {{tt|40}} || Black
| colspan="4" style="background: #000; color: white" | 0,{{nnbsp}}0,{{nnbsp}}0
| style="background: #0c0c0c; color: white" | 12,{{nnbsp}}12,{{nnbsp}}12
| colspan="4" style="background: #000; color: white" | 0,{{nnbsp}}0,{{nnbsp}}0
| style="background: #010101; color: white" | 1,{{nnbsp}}1,{{nnbsp}}1
| style="background: #000; color: white" | 0,{{nnbsp}}0,{{nnbsp}}0
|-
| {{tt|31}} || {{tt|41}} || Red
| style="background: #AA0000; color: white" | 170,{{nnbsp}}0,{{nnbsp}}0
| colspan="2" style="background: #800000; color: white" | 128,{{nnbsp}}0,{{nnbsp}}0
| style="background: #cd3131; color: white" | 205, 49, 49
| style="background: #c50f1f; color: white" | 197,{{nnbsp}}15,{{nnbsp}}31
| style="background: #990000; color: white" | 153,{{nnbsp}}0,{{nnbsp}}0
| style="background: #bb0000; color: white" | 187,{{nnbsp}}0,{{nnbsp}}0
| style="background: #7f0000; color: white" | 127,{{nnbsp}}0,{{nnbsp}}0
| style="background: #cd0000; color: white" | 205,{{nnbsp}}0,{{nnbsp}}0
| style="background: #de382b; color: white" | 222,{{nnbsp}}56,{{nnbsp}}43
| style="background: #cd0000; color: white" | 205,{{nnbsp}}0,{{nnbsp}}0
|-
| {{tt|32}} || {{tt|42}} || Green
| style="background: #00AA00; color: white" | 0,{{nnbsp}}170,{{nnbsp}}0
| colspan="2" style="background: #008000; color: white" | 0,{{nnbsp}}128,{{nnbsp}}0
| style="background: #0dbc79; color: white" | 13, 188, 121
| style="background: #13a10e; color: white" | 19,{{nnbsp}}161,{{nnbsp}}14
| style="background: #00A600; color: white" | 0,{{nnbsp}}166,{{nnbsp}}0
| style="background: #00bb00; color: white" | 0,{{nnbsp}}187,{{nnbsp}}0
| style="background: #009300; color: white" | 0,{{nnbsp}}147,{{nnbsp}}0
| style="background: #00cd00; color: white" | 0,{{nnbsp}}205,{{nnbsp}}0
| style="background: #39b54a; color: black" | 57,{{nnbsp}}181,{{nnbsp}}74
| style="background: #00cd00; color: white" | 0,{{nnbsp}}205,{{nnbsp}}0
|-
| {{tt|33}} || {{tt|43}} || Yellow
| style="background: #AA5500; color: white" | 170,{{nnbsp}}85,{{nnbsp}}0{{ efn | On terminals based on [[Color Graphics Adapter|CGA]] compatible hardware, such as ANSI.SYS running on DOS, this normal intensity foreground color is rendered as orange. CGA [[Color Graphics Adapter#With an RGBI monitor|RGBI]] monitors contained hardware to modify the dark yellow color to an orange/brown color by reducing the green component<ref>{{cite web|url=https://int10h.org/blog/2022/06/ibm-5153-color-true-cga-palette/|title=The IBM 5153's True CGA Palette and Color Output|publisher=VileR|date=2022-06-11|access-date=2024-05-18}}</ref> }}
| style="background: #808000; color: white" | 128,{{nnbsp}}128,{{nnbsp}}0
| style="background: #eeedf0; color: black" | 238,{{nnbsp}}237,{{nnbsp}}240
| style="background: #e5e510; color: black" | 229, 229, 16
| style="background: #c19c00; color: white" | 193,{{nnbsp}}156,{{nnbsp}}0
| style="background: #999900; color: white" | 153,{{nnbsp}}153,{{nnbsp}}0
| style="background: #bbbb00; color: black" | 187,{{nnbsp}}187,{{nnbsp}}0
| style="background: #fc7f00; color: white" | 252,{{nnbsp}}127,{{nnbsp}}0
| style="background: #cdcd00; color: black" | 205,{{nnbsp}}205,{{nnbsp}}0
| style="background: #ffc706; color: black" | 255,{{nnbsp}}199,{{nnbsp}}6
| style="background: #cdcd00; color: black" | 205,{{nnbsp}}205,{{nnbsp}}0
|-
| {{tt|34}} || {{tt|44}} || Blue
| style="background: #0000AA; color: white" | 0,{{nnbsp}}0,{{nnbsp}}170
| colspan="2" style="background: #000080; color: white" | 0,{{nnbsp}}0,{{nnbsp}}128
| style="background: #2472c8; color: white" | 36, 114, 200
| style="background: #0037da; color: white" | 0,{{nnbsp}}55,{{nnbsp}}218
| style="background: #0000B2; color: white" | 0,{{nnbsp}}0,{{nnbsp}}178
| style="background: #0000bb; color: white" | 0,{{nnbsp}}0,{{nnbsp}}187
| style="background: #00007f; color: white" | 0,{{nnbsp}}0,{{nnbsp}}127
| style="background: #0000ee; color: white" | 0,{{nnbsp}}0,{{nnbsp}}238<ref>Changed from 0,{{nnbsp}}0,{{nnbsp}}205 in July 2004 {{cite web |url=http://invisible-island.net/xterm/xterm.log.html#xterm_192 |title=Patch #192 – 2004/7/12 – XFree86 4.4.99.9}}</ref>
| style="background: #006fb8; color: white" | 0,{{nnbsp}}111,{{nnbsp}}184
| style="background: #0000ee; color: white" | 0,{{nnbsp}}0,{{nnbsp}}238
|-
| {{tt|35}} || {{tt|45}} || Magenta
| style="background: #AA00AA; color: white" | 170,{{nnbsp}}0,{{nnbsp}}170
| style="background: #800080; color: white" | 128,{{nnbsp}}0,{{nnbsp}}128
| style="background: #012456; color: white" | 1,{{nnbsp}}36,{{nnbsp}}86
| style="background: #bc3fbc; color: white" | 188, 63, 188
| style="background: #881798; color: white" | 136,{{nnbsp}}23,{{nnbsp}}152
| style="background: #B200B2; color: white" | 178,{{nnbsp}}0,{{nnbsp}}178
| style="background: #bb00bb; color: white" | 187,{{nnbsp}}0,{{nnbsp}}187
| style="background: #9c009c; color: white" | 156,{{nnbsp}}0,{{nnbsp}}156
| style="background: #cd00cd; color: white" | 205,{{nnbsp}}0,{{nnbsp}}205
| style="background: #762671; color: white" | 118,{{nnbsp}}38,{{nnbsp}}113
| style="background: #cd00cd; color: white" | 205,{{nnbsp}}0,{{nnbsp}}205
|-
| {{tt|36}} || {{tt|46}} || Cyan
| style="background: #00AAAA; color: white" | 0,{{nnbsp}}170,{{nnbsp}}170
| colspan="2" style="background: #008080; color: white" | 0,{{nnbsp}}128,{{nnbsp}}128
| style="background: #11a8cd; color: white" | 17, 168, 205
| style="background: #3a96dd; color: white" | 58,{{nnbsp}}150,{{nnbsp}}221
| style="background: #00A6B2; color: white" | 0,{{nnbsp}}166,{{nnbsp}}178
| style="background: #00bbbb; color: black" | 0,{{nnbsp}}187,{{nnbsp}}187
| style="background: #009393; color: white" | 0,{{nnbsp}}147,{{nnbsp}}147
| style="background: #00cdcd; color: black" | 0,{{nnbsp}}205,{{nnbsp}}205
| style="background: #2cb5e9; color: black" | 44,{{nnbsp}}181,{{nnbsp}}233
| style="background: #00cdcd; color: black" | 0,{{nnbsp}}205,{{nnbsp}}205
|-
| {{tt|37}} || {{tt|47}} || White
| style="background: #AAAAAA; color: black" | 170,{{nnbsp}}170,{{nnbsp}}170
| colspan="2" style="background: #c0c0c0; color: black" | 192,{{nnbsp}}192,{{nnbsp}}192
| style="background: #e5e5e5; color: black" | 229, 229, 229
| style="background: #cccccc; color: black" | 204,{{nnbsp}}204,{{nnbsp}}204
| style="background: #BFBFBF; color: black" | 191,{{nnbsp}}191,{{nnbsp}}191
| style="background: #bbbbbb; color: black" | 187,{{nnbsp}}187,{{nnbsp}}187
| style="background: #d2d2d2; color: black" | 210,{{nnbsp}}210,{{nnbsp}}210
| style="background: #e5e5e5; color: black" | 229,{{nnbsp}}229,{{nnbsp}}229
| style="background: #cccccc; color: black" | 204,{{nnbsp}}204,{{nnbsp}}204
| style="background: #e5e5e5; color: black" | 229,{{nnbsp}}229,{{nnbsp}}229
|-
| {{tt|90}} || {{tt|100}} || {{nobr|Bright Black (Gray)}}
| style="background: #555555; color: white" | 85,{{nnbsp}}85,{{nnbsp}}85
| colspan="2" style="background: #808080; color: black" | 128,{{nnbsp}}128,{{nnbsp}}128
| style="background: #666666; color: white" | 102, 102, 102
| style="background: #767676; color: white" | 118,{{nnbsp}}118,{{nnbsp}}118
| style="background: #666666; color: white" | 102,{{nnbsp}}102,{{nnbsp}}102
| style="background: #555555; color: white" | 85,{{nnbsp}}85,{{nnbsp}}85
| style="background: #7f7f7f; color: white" | 127,{{nnbsp}}127,{{nnbsp}}127
| style="background: #7f7f7f; color: white" | 127,{{nnbsp}}127,{{nnbsp}}127
| style="background: #808080; color: black" | 128,{{nnbsp}}128,{{nnbsp}}128
| style="background: #000000; color: white" | 0,{{nnbsp}}0,{{nnbsp}}0
|-
| {{tt|91}} || {{tt|101}} || Bright Red
| style="background: #FF5555; color: white" | 255,{{nnbsp}}85,{{nnbsp}}85
| colspan="2" style="background: #ff0000; color: white" | 255,{{nnbsp}}0,{{nnbsp}}0
| style="background: #f14c4c; color: white" | 241, 76, 76
| style="background: #e74856; color: white" | 231,{{nnbsp}}72,{{nnbsp}}86
| style="background: #E60000; color: white" | 230,{{nnbsp}}0,{{nnbsp}}0
| style="background: #ff5555; color: white" | 255,{{nnbsp}}85,{{nnbsp}}85
| colspan="4" style="background: #ff0000; color: white" | 255,{{nnbsp}}0,{{nnbsp}}0
|-
| {{tt|92}} || {{tt|102}} || Bright Green
| style="background: #55FF55; color: black" | 85,{{nnbsp}}255,{{nnbsp}}85
| colspan="2" style="background: #00ff00; color: black" | 0,{{nnbsp}}255,{{nnbsp}}0
| style="background: #23d18b; color: white" | 35, 209, 139
| style="background: #16c60c; color: black" | 22,{{nnbsp}}198,{{nnbsp}}12
| style="background: #00D900; color: black" | 0,{{nnbsp}}217,{{nnbsp}}0
| style="background: #55ff55; color: black" | 85,{{nnbsp}}255,{{nnbsp}}85
| style="background: #00fc00; color: black" | 0,{{nnbsp}}252,{{nnbsp}}0
| colspan="3" style="background: #00ff00; color: black" | 0,{{nnbsp}}255,{{nnbsp}}0
|-
| {{tt|93}} || {{tt|103}} || Bright Yellow
| style="background: #FFFF55; color: black" | 255,{{nnbsp}}255,{{nnbsp}}85
| colspan="2" style="background: #ffff00; color: black" | 255,{{nnbsp}}255,{{nnbsp}}0
| style="background: #f5f543; color: black" | 245, 245, 67
| style="background: #f9f1a5; color: black" | 249,{{nnbsp}}241,{{nnbsp}}165
| style="background: #E5E500; color: black" | 230,{{nnbsp}}230,{{nnbsp}}0
| style="background: #ffff55; color: black" | 255,{{nnbsp}}255,{{nnbsp}}85
| colspan="4" style="background: #ffff00; color: black" | 255,{{nnbsp}}255,{{nnbsp}}0
|-
| {{tt|94}} || {{tt|104}} || Bright Blue
| style="background: #5555FF; color: white" | 85,{{nnbsp}}85,{{nnbsp}}255
| colspan="2" style="background: #0000ff; color: white" | 0,{{nnbsp}}0,{{nnbsp}}255
| style="background: #3b8eea; color: white" | 59, 142, 234
| style="background: #3b78ff; color: white" | 59,{{nnbsp}}120,{{nnbsp}}255
| style="background: #0000FF; color: white" | 0,{{nnbsp}}0,{{nnbsp}}255
| style="background: #5555ff; color: white" | 85,{{nnbsp}}85,{{nnbsp}}255
| style="background: #0000fc; color: white" | 0,{{nnbsp}}0,{{nnbsp}}252
| style="background: #5c5cff; color: white" | 92,{{nnbsp}}92,{{nnbsp}}255<ref>Changed from 0,{{nnbsp}}0,{{nnbsp}}255 in July 2004 {{cite web |url=http://invisible-island.net/xterm/xterm.log.html#xterm_192 |title=Patch #192 – 2004/7/12 – XFree86 4.4.99.9}}</ref>
| style="background: #0000ff; color: white" | 0,{{nnbsp}}0,{{nnbsp}}255
| style="background: #5c5cff; color: white" | 92,{{nnbsp}}92,{{nnbsp}}255
|-
| {{tt|95}} || {{tt|105}} || Bright Magenta
| style="background: #FF55FF; color: black" | 255,{{nnbsp}}85,{{nnbsp}}255
| colspan="2" style="background: #ff00ff; color: white" | 255,{{nnbsp}}0,{{nnbsp}}255
| style="background: #d670d6; color: white" | 214, 112, 214
| style="background: #b4009e; color: white" | 180,{{nnbsp}}0,{{nnbsp}}158
| style="background: #E600E6; color: white" | 230,{{nnbsp}}0,{{nnbsp}}230
| style="background: #ff55ff; color: white" | 255,{{nnbsp}}85,{{nnbsp}}255
| colspan="4" style="background: #ff00ff; color: white" | 255,{{nnbsp}}0,{{nnbsp}}255
|-
| {{tt|96}} || {{tt|106}} || Bright Cyan
| style="background: #55FFFF; color: black" | 85,{{nnbsp}}255,{{nnbsp}}255
| colspan="2" style="background: #00ffff; color: black" | 0,{{nnbsp}}255,{{nnbsp}}255
| style="background: #29b8dB; color: white" | 41, 184, 219
| style="background: #61d6d6; color: black" | 97,{{nnbsp}}214,{{nnbsp}}214
| style="background: #00E6E6; color: black" | 0,{{nnbsp}}230,{{nnbsp}}230
| style="background: #55ffff; color: black" | 85,{{nnbsp}}255,{{nnbsp}}255
| colspan="4" style="background: #00ffff; color: black" | 0,{{nnbsp}}255,{{nnbsp}}255
|-
| {{tt|97}} || {{tt|107}} || Bright White
| colspan="3" style="background: #ffffff; color: black" | 255,{{nnbsp}}255,{{nnbsp}}255
| style="background: #e5e5e5; color: black" | {{nobr|229, 229, 229}}
| style="background: #f2f2f2; color: black" | 242,{{nnbsp}}242,{{nnbsp}}242
| style="background: #E6E6E6; color: black" | 230,{{nnbsp}}230,{{nnbsp}}230
| colspan="5" style="background: #ffffff; color: black" | 255,{{nnbsp}}255,{{nnbsp}}255
|}
</div>

==== 8-bit ====
{{seealso|Web colors#Web-safe colors}}
As [[8-bit color|256-color]] lookup tables became common on graphic cards, escape sequences were added to select from a pre-defined set of 256 colors:<ref>{{cite web |url=https://invisible-island.net/xterm/xterm.faq.html#color_by_number |title=XTerm FAQ: Can I set a color by its number? |author-first=Thomas E. |author-last=Dickey |accessdate=March 28, 2025}}</ref>
 ESC[38;5;{{angbr|n}}m Select foreground color      where n is a number from the table below
 ESC[48;5;{{angbr|n}}m Select background color
   0-  7:  standard colors (as in ESC [ 30–37 m)
   8- 15:  high intensity colors (as in ESC [ 90–97 m)
  16-231:  6 × 6 × 6 cube (216 colors): 16 + 36 × r + 6 × g + b (0 ≤ r, g, b ≤ 5)
 232-255:  grayscale from dark to light in 24 steps

The colors displayed by these values vary across terminal/emulator implementations as the recognized ECMA-48 and ITU's T.416 specifications do not define a specific color palette for this lookup table. While it is common to use the above formula for the color palette, in particular the algorithm and choice of colors for the 16-231 cube values differs between implementations. The color palette and algorithm used by XTerm is specified below as a sample.<ref name="ECMA-48" /><ref name="T.416" />

The [[ITU]]'s T.416 Information technology - Open Document Architecture (ODA) and interchange format: Character content architectures<ref name="T.416">{{cite web |url=https://www.itu.int/rec/dologin_pub.asp?lang=e&id=T-REC-T.416-199303-I!!PDF-E&type=items |title=T.416 Information technology - Open Document Architecture (ODA) and interchange format: Character content architectures}}</ref> uses ":" as separator characters instead:
 ESC[38:5:{{angbr|n}}m Select foreground color      where n is a number from the table below
 ESC[48:5:{{angbr|n}}m Select background color<!--
def fg(triad): return 'ffffff' if (triad[2:4] < 'a0') else '000000'
standards = ('000000 800000 008000 808000 000080 800080 008080 c0c0c0 ' +
             '808080 ff0000 00ff00 ffff00 0000ff ff00ff 00ffff ffffff').split(' ')
rgbs  = '00 5f 87 af d7 ff'.split(' ')
greys = '08 12 1c 26 30 3a 44 4e 58 62 6c 76 80 8a 94 9e a8 b2 bc c6 d0 da e4 ee'.split(' ')
fgs   = '000000 ffffff'.split(' ')
code = 0
outs = [[] for i in range(3)]
out  = '\n| style="color:#%s;background:#%s;" title="#%s" |%s'
for i in range(len(standards)):
 if (i == len(standards) / 2.0): outs[0].append('\n| style="width:1em;"| ')
 triad = standards[i]
 outs[0].append(out % (fgs[i < len(standards) / 2], triad, triad,
                code if (code > 9) else ' %d&nbsp;' % code))
 code += 1
for   r in range(len(rgbs)):
 for  g in range(len(rgbs)):
  for b in range(len(rgbs)):
   triad = rgbs[r] + rgbs[g] + rgbs[b]
   outs[1].append(out % (fgs[g < len(rgbs) / 2], triad, triad, code))
   code += 1
 outs[1].append('\n|-\n')
for i in range(len(greys)):
 triad = greys[i] * 3
 outs[2].append(out % (fgs[i < len(greys) / 2], triad, triad, code))
 code += 1
file_out = open(__file__[:__file__.rfind('.')] + '.htm', 'w')
file_out.write('''\
{| table class="collapsible" style="text-align:center;font-size:80%%;width:100%%;background:#f6f6f6;cursor:default;" cellpadding="0" cellspacing="1"
|-
! colspan="36" | 256-color mode — foreground: ESC[38;5;#m &nbsp; background: ESC[48;5;#m
|-
| colspan="18" | Standard colors
| colspan="18" | High-intensity colors
|-
| colspan="36" |
{| style="width:100%%;text-align:center;font-weight:bold;"
|-
%s
|-
|}
|-
| colspan="36" | 216 colors
|-
%s
|-
| colspan="36" | Grayscale colors
|-
| colspan="36" |
{| style="width:100%%;text-align:center;font-weight:bold;"
|-
%s
|-
|}
|}''' %
 (''.join(outs[0]), ''.join(outs[1]), ''.join(outs[2])))
file_out.close()
-->
{{anchor|256_color_table}}
{| class="collapsible" style="text-align:center;font-size:80%;width:100%;background:#f6f6f6;cursor:default;" cellpadding="0" cellspacing="1"
|-
! colspan="36" | 256-color mode — foreground: ESC[38;5;#m &nbsp; background: ESC[48;5;#m
|-

| colspan="18" | Standard colors
| colspan="18" | High-intensity colors

|-
| colspan="36" |
{| style="width:100%;text-align:center;font-weight:bold;"
|-
| style="color:#ffffff;background:#000000;" title="#000000" |&nbsp;0&nbsp;
| style="color:#ffffff;background:#800000;" title="#800000" |&nbsp;1&nbsp;
| style="color:#ffffff;background:#008000;" title="#008000" |&nbsp;2&nbsp;
| style="color:#ffffff;background:#808000;" title="#808000" |&nbsp;3&nbsp;
| style="color:#ffffff;background:#000080;" title="#000080" |&nbsp;4&nbsp;
| style="color:#ffffff;background:#800080;" title="#800080" |&nbsp;5&nbsp;
| style="color:#ffffff;background:#008080;" title="#008080" |&nbsp;6&nbsp;
| style="color:#ffffff;background:#c0c0c0;" title="#c0c0c0" |&nbsp;7&nbsp;
| style="width:1em;" |
| style="color:#000000;background:#808080;" title="#808080" |&nbsp;8&nbsp;
| style="color:#000000;background:#ff0000;" title="#ff0000" |&nbsp;9&nbsp;
| style="color:#000000;background:#00ff00;" title="#00ff00" |10
| style="color:#000000;background:#ffff00;" title="#ffff00" |11
| style="color:#000000;background:#0000ff;" title="#0000ff" |12
| style="color:#000000;background:#ff00ff;" title="#ff00ff" |13
| style="color:#000000;background:#00ffff;" title="#00ffff" |14
| style="color:#000000;background:#ffffff;" title="#ffffff" |15
|}
|-
| colspan="36" |216 colors
|-
| style="color:#ffffff;background:#000000;" title="#000000" |16
| style="color:#ffffff;background:#00005f;" title="#00005f" |17
| style="color:#ffffff;background:#000087;" title="#000087" |18
| style="color:#ffffff;background:#0000af;" title="#0000af" |19
| style="color:#ffffff;background:#0000d7;" title="#0000d7" |20
| style="color:#ffffff;background:#0000ff;" title="#0000ff" |21
| style="color:#ffffff;background:#005f00;" title="#005f00" |22
| style="color:#ffffff;background:#005f5f;" title="#005f5f" |23
| style="color:#ffffff;background:#005f87;" title="#005f87" |24
| style="color:#ffffff;background:#005faf;" title="#005faf" |25
| style="color:#ffffff;background:#005fd7;" title="#005fd7" |26
| style="color:#ffffff;background:#005fff;" title="#005fff" |27
| style="color:#ffffff;background:#008700;" title="#008700" |28
| style="color:#ffffff;background:#00875f;" title="#00875f" |29
| style="color:#ffffff;background:#008787;" title="#008787" |30
| style="color:#ffffff;background:#0087af;" title="#0087af" |31
| style="color:#ffffff;background:#0087d7;" title="#0087d7" |32
| style="color:#ffffff;background:#0087ff;" title="#0087ff" |33
| style="color:#000000;background:#00af00;" title="#00af00" |34
| style="color:#000000;background:#00af5f;" title="#00af5f" |35
| style="color:#000000;background:#00af87;" title="#00af87" |36
| style="color:#000000;background:#00afaf;" title="#00afaf" |37
| style="color:#000000;background:#00afd7;" title="#00afd7" |38
| style="color:#000000;background:#00afff;" title="#00afff" |39
| style="color:#000000;background:#00d700;" title="#00d700" |40
| style="color:#000000;background:#00d75f;" title="#00d75f" |41
| style="color:#000000;background:#00d787;" title="#00d787" |42
| style="color:#000000;background:#00d7af;" title="#00d7af" |43
| style="color:#000000;background:#00d7d7;" title="#00d7d7" |44
| style="color:#000000;background:#00d7ff;" title="#00d7ff" |45
| style="color:#000000;background:#00ff00;" title="#00ff00" |46
| style="color:#000000;background:#00ff5f;" title="#00ff5f" |47
| style="color:#000000;background:#00ff87;" title="#00ff87" |48
| style="color:#000000;background:#00ffaf;" title="#00ffaf" |49
| style="color:#000000;background:#00ffd7;" title="#00ffd7" |50
| style="color:#000000;background:#00ffff;" title="#00ffff" |51
|-
| style="color:#ffffff;background:#5f0000;" title="#5f0000" |52
| style="color:#ffffff;background:#5f005f;" title="#5f005f" |53
| style="color:#ffffff;background:#5f0087;" title="#5f0087" |54
| style="color:#ffffff;background:#5f00af;" title="#5f00af" |55
| style="color:#ffffff;background:#5f00d7;" title="#5f00d7" |56
| style="color:#ffffff;background:#5f00ff;" title="#5f00ff" |57
| style="color:#ffffff;background:#5f5f00;" title="#5f5f00" |58
| style="color:#ffffff;background:#5f5f5f;" title="#5f5f5f" |59
| style="color:#ffffff;background:#5f5f87;" title="#5f5f87" |60
| style="color:#ffffff;background:#5f5faf;" title="#5f5faf" |61
| style="color:#ffffff;background:#5f5fd7;" title="#5f5fd7" |62
| style="color:#ffffff;background:#5f5fff;" title="#5f5fff" |63
| style="color:#ffffff;background:#5f8700;" title="#5f8700" |64
| style="color:#ffffff;background:#5f875f;" title="#5f875f" |65
| style="color:#ffffff;background:#5f8787;" title="#5f8787" |66
| style="color:#ffffff;background:#5f87af;" title="#5f87af" |67
| style="color:#ffffff;background:#5f87d7;" title="#5f87d7" |68
| style="color:#ffffff;background:#5f87ff;" title="#5f87ff" |69
| style="color:#000000;background:#5faf00;" title="#5faf00" |70
| style="color:#000000;background:#5faf5f;" title="#5faf5f" |71
| style="color:#000000;background:#5faf87;" title="#5faf87" |72
| style="color:#000000;background:#5fafaf;" title="#5fafaf" |73
| style="color:#000000;background:#5fafd7;" title="#5fafd7" |74
| style="color:#000000;background:#5fafff;" title="#5fafff" |75
| style="color:#000000;background:#5fd700;" title="#5fd700" |76
| style="color:#000000;background:#5fd75f;" title="#5fd75f" |77
| style="color:#000000;background:#5fd787;" title="#5fd787" |78
| style="color:#000000;background:#5fd7af;" title="#5fd7af" |79
| style="color:#000000;background:#5fd7d7;" title="#5fd7d7" |80
| style="color:#000000;background:#5fd7ff;" title="#5fd7ff" |81
| style="color:#000000;background:#5fff00;" title="#5fff00" |82
| style="color:#000000;background:#5fff5f;" title="#5fff5f" |83
| style="color:#000000;background:#5fff87;" title="#5fff87" |84
| style="color:#000000;background:#5fffaf;" title="#5fffaf" |85
| style="color:#000000;background:#5fffd7;" title="#5fffd7" |86
| style="color:#000000;background:#5fffff;" title="#5fffff" |87
|-
| style="color:#ffffff;background:#870000;" title="#870000" |88
| style="color:#ffffff;background:#87005f;" title="#87005f" |89
| style="color:#ffffff;background:#870087;" title="#870087" |90
| style="color:#ffffff;background:#8700af;" title="#8700af" |91
| style="color:#ffffff;background:#8700d7;" title="#8700d7" |92
| style="color:#ffffff;background:#8700ff;" title="#8700ff" |93
| style="color:#ffffff;background:#875f00;" title="#875f00" |94
| style="color:#ffffff;background:#875f5f;" title="#875f5f" |95
| style="color:#ffffff;background:#875f87;" title="#875f87" |96
| style="color:#ffffff;background:#875faf;" title="#875faf" |97
| style="color:#ffffff;background:#875fd7;" title="#875fd7" |98
| style="color:#ffffff;background:#875fff;" title="#875fff" |99
| style="color:#ffffff;background:#878700;" title="#878700" |100
| style="color:#ffffff;background:#87875f;" title="#87875f" |101
| style="color:#ffffff;background:#878787;" title="#878787" |102
| style="color:#ffffff;background:#8787af;" title="#8787af" |103
| style="color:#ffffff;background:#8787d7;" title="#8787d7" |104
| style="color:#ffffff;background:#8787ff;" title="#8787ff" |105
| style="color:#000000;background:#87af00;" title="#87af00" |106
| style="color:#000000;background:#87af5f;" title="#87af5f" |107
| style="color:#000000;background:#87af87;" title="#87af87" |108
| style="color:#000000;background:#87afaf;" title="#87afaf" |109
| style="color:#000000;background:#87afd7;" title="#87afd7" |110
| style="color:#000000;background:#87afff;" title="#87afff" |111
| style="color:#000000;background:#87d700;" title="#87d700" |112
| style="color:#000000;background:#87d75f;" title="#87d75f" |113
| style="color:#000000;background:#87d787;" title="#87d787" |114
| style="color:#000000;background:#87d7af;" title="#87d7af" |115
| style="color:#000000;background:#87d7d7;" title="#87d7d7" |116
| style="color:#000000;background:#87d7ff;" title="#87d7ff" |117
| style="color:#000000;background:#87ff00;" title="#87ff00" |118
| style="color:#000000;background:#87ff5f;" title="#87ff5f" |119
| style="color:#000000;background:#87ff87;" title="#87ff87" |120
| style="color:#000000;background:#87ffaf;" title="#87ffaf" |121
| style="color:#000000;background:#87ffd7;" title="#87ffd7" |122
| style="color:#000000;background:#87ffff;" title="#87ffff" |123
|-
| style="color:#ffffff;background:#af0000;" title="#af0000" |124
| style="color:#ffffff;background:#af005f;" title="#af005f" |125
| style="color:#ffffff;background:#af0087;" title="#af0087" |126
| style="color:#ffffff;background:#af00af;" title="#af00af" |127
| style="color:#ffffff;background:#af00d7;" title="#af00d7" |128
| style="color:#ffffff;background:#af00ff;" title="#af00ff" |129
| style="color:#ffffff;background:#af5f00;" title="#af5f00" |130
| style="color:#ffffff;background:#af5f5f;" title="#af5f5f" |131
| style="color:#ffffff;background:#af5f87;" title="#af5f87" |132
| style="color:#ffffff;background:#af5faf;" title="#af5faf" |133
| style="color:#ffffff;background:#af5fd7;" title="#af5fd7" |134
| style="color:#ffffff;background:#af5fff;" title="#af5fff" |135
| style="color:#ffffff;background:#af8700;" title="#af8700" |136
| style="color:#ffffff;background:#af875f;" title="#af875f" |137
| style="color:#ffffff;background:#af8787;" title="#af8787" |138
| style="color:#ffffff;background:#af87af;" title="#af87af" |139
| style="color:#ffffff;background:#af87d7;" title="#af87d7" |140
| style="color:#ffffff;background:#af87ff;" title="#af87ff" |141
| style="color:#000000;background:#afaf00;" title="#afaf00" |142
| style="color:#000000;background:#afaf5f;" title="#afaf5f" |143
| style="color:#000000;background:#afaf87;" title="#afaf87" |144
| style="color:#000000;background:#afafaf;" title="#afafaf" |145
| style="color:#000000;background:#afafd7;" title="#afafd7" |146
| style="color:#000000;background:#afafff;" title="#afafff" |147
| style="color:#000000;background:#afd700;" title="#afd700" |148
| style="color:#000000;background:#afd75f;" title="#afd75f" |149
| style="color:#000000;background:#afd787;" title="#afd787" |150
| style="color:#000000;background:#afd7af;" title="#afd7af" |151
| style="color:#000000;background:#afd7d7;" title="#afd7d7" |152
| style="color:#000000;background:#afd7ff;" title="#afd7ff" |153
| style="color:#000000;background:#afff00;" title="#afff00" |154
| style="color:#000000;background:#afff5f;" title="#afff5f" |155
| style="color:#000000;background:#afff87;" title="#afff87" |156
| style="color:#000000;background:#afffaf;" title="#afffaf" |157
| style="color:#000000;background:#afffd7;" title="#afffd7" |158
| style="color:#000000;background:#afffff;" title="#afffff" |159
|-
| style="color:#ffffff;background:#d70000;" title="#d70000" |160
| style="color:#ffffff;background:#d7005f;" title="#d7005f" |161
| style="color:#ffffff;background:#d70087;" title="#d70087" |162
| style="color:#ffffff;background:#d700af;" title="#d700af" |163
| style="color:#ffffff;background:#d700d7;" title="#d700d7" |164
| style="color:#ffffff;background:#d700ff;" title="#d700ff" |165
| style="color:#ffffff;background:#d75f00;" title="#d75f00" |166
| style="color:#ffffff;background:#d75f5f;" title="#d75f5f" |167
| style="color:#ffffff;background:#d75f87;" title="#d75f87" |168
| style="color:#ffffff;background:#d75faf;" title="#d75faf" |169
| style="color:#ffffff;background:#d75fd7;" title="#d75fd7" |170
| style="color:#ffffff;background:#d75fff;" title="#d75fff" |171
| style="color:#ffffff;background:#d78700;" title="#d78700" |172
| style="color:#ffffff;background:#d7875f;" title="#d7875f" |173
| style="color:#ffffff;background:#d78787;" title="#d78787" |174
| style="color:#ffffff;background:#d787af;" title="#d787af" |175
| style="color:#ffffff;background:#d787d7;" title="#d787d7" |176
| style="color:#ffffff;background:#d787ff;" title="#d787ff" |177
| style="color:#000000;background:#d7af00;" title="#d7af00" |178
| style="color:#000000;background:#d7af5f;" title="#d7af5f" |179
| style="color:#000000;background:#d7af87;" title="#d7af87" |180
| style="color:#000000;background:#d7afaf;" title="#d7afaf" |181
| style="color:#000000;background:#d7afd7;" title="#d7afd7" |182
| style="color:#000000;background:#d7afff;" title="#d7afff" |183
| style="color:#000000;background:#d7d700;" title="#d7d700" |184
| style="color:#000000;background:#d7d75f;" title="#d7d75f" |185
| style="color:#000000;background:#d7d787;" title="#d7d787" |186
| style="color:#000000;background:#d7d7af;" title="#d7d7af" |187
| style="color:#000000;background:#d7d7d7;" title="#d7d7d7" |188
| style="color:#000000;background:#d7d7ff;" title="#d7d7ff" |189
| style="color:#000000;background:#d7ff00;" title="#d7ff00" |190
| style="color:#000000;background:#d7ff5f;" title="#d7ff5f" |191
| style="color:#000000;background:#d7ff87;" title="#d7ff87" |192
| style="color:#000000;background:#d7ffaf;" title="#d7ffaf" |193
| style="color:#000000;background:#d7ffd7;" title="#d7ffd7" |194
| style="color:#000000;background:#d7ffff;" title="#d7ffff" |195
|-
| style="color:#ffffff;background:#ff0000;" title="#ff0000" |196
| style="color:#ffffff;background:#ff005f;" title="#ff005f" |197
| style="color:#ffffff;background:#ff0087;" title="#ff0087" |198
| style="color:#ffffff;background:#ff00af;" title="#ff00af" |199
| style="color:#ffffff;background:#ff00d7;" title="#ff00d7" |200
| style="color:#ffffff;background:#ff00ff;" title="#ff00ff" |201
| style="color:#ffffff;background:#ff5f00;" title="#ff5f00" |202
| style="color:#ffffff;background:#ff5f5f;" title="#ff5f5f" |203
| style="color:#ffffff;background:#ff5f87;" title="#ff5f87" |204
| style="color:#ffffff;background:#ff5faf;" title="#ff5faf" |205
| style="color:#ffffff;background:#ff5fd7;" title="#ff5fd7" |206
| style="color:#ffffff;background:#ff5fff;" title="#ff5fff" |207
| style="color:#ffffff;background:#ff8700;" title="#ff8700" |208
| style="color:#ffffff;background:#ff875f;" title="#ff875f" |209
| style="color:#ffffff;background:#ff8787;" title="#ff8787" |210
| style="color:#ffffff;background:#ff87af;" title="#ff87af" |211
| style="color:#ffffff;background:#ff87d7;" title="#ff87d7" |212
| style="color:#ffffff;background:#ff87ff;" title="#ff87ff" |213
| style="color:#000000;background:#ffaf00;" title="#ffaf00" |214
| style="color:#000000;background:#ffaf5f;" title="#ffaf5f" |215
| style="color:#000000;background:#ffaf87;" title="#ffaf87" |216
| style="color:#000000;background:#ffafaf;" title="#ffafaf" |217
| style="color:#000000;background:#ffafd7;" title="#ffafd7" |218
| style="color:#000000;background:#ffafff;" title="#ffafff" |219
| style="color:#000000;background:#ffd700;" title="#ffd700" |220
| style="color:#000000;background:#ffd75f;" title="#ffd75f" |221
| style="color:#000000;background:#ffd787;" title="#ffd787" |222
| style="color:#000000;background:#ffd7af;" title="#ffd7af" |223
| style="color:#000000;background:#ffd7d7;" title="#ffd7d7" |224
| style="color:#000000;background:#ffd7ff;" title="#ffd7ff" |225
| style="color:#000000;background:#ffff00;" title="#ffff00" |226
| style="color:#000000;background:#ffff5f;" title="#ffff5f" |227
| style="color:#000000;background:#ffff87;" title="#ffff87" |228
| style="color:#000000;background:#ffffaf;" title="#ffffaf" |229
| style="color:#000000;background:#ffffd7;" title="#ffffd7" |230
| style="color:#000000;background:#ffffff;" title="#ffffff" |231
|-

|-
| colspan="36" |Grayscale colors
|-
| colspan="36" |
{| style="width:100%;text-align:center;font-weight:bold;"
|-
| style="color:#ffffff;background:#080808;" title="#080808" |232
| style="color:#ffffff;background:#121212;" title="#121212" |233
| style="color:#ffffff;background:#1c1c1c;" title="#1c1c1c" |234
| style="color:#ffffff;background:#262626;" title="#262626" |235
| style="color:#ffffff;background:#303030;" title="#303030" |236
| style="color:#ffffff;background:#3a3a3a;" title="#3a3a3a" |237
| style="color:#ffffff;background:#444444;" title="#444444" |238
| style="color:#ffffff;background:#4e4e4e;" title="#4e4e4e" |239
| style="color:#ffffff;background:#585858;" title="#585858" |240
| style="color:#ffffff;background:#626262;" title="#626262" |241
| style="color:#ffffff;background:#6c6c6c;" title="#6c6c6c" |242
| style="color:#ffffff;background:#767676;" title="#767676" |243
| style="color:#000000;background:#808080;" title="#808080" |244
| style="color:#000000;background:#8a8a8a;" title="#8a8a8a" |245
| style="color:#000000;background:#949494;" title="#949494" |246
| style="color:#000000;background:#9e9e9e;" title="#9e9e9e" |247
| style="color:#000000;background:#a8a8a8;" title="#a8a8a8" |248
| style="color:#000000;background:#b2b2b2;" title="#b2b2b2" |249
| style="color:#000000;background:#bcbcbc;" title="#bcbcbc" |250
| style="color:#000000;background:#c6c6c6;" title="#c6c6c6" |251
| style="color:#000000;background:#d0d0d0;" title="#d0d0d0" |252
| style="color:#000000;background:#dadada;" title="#dadada" |253
| style="color:#000000;background:#e4e4e4;" title="#e4e4e4" |254
| style="color:#000000;background:#eeeeee;" title="#eeeeee" |255
|}
|}


To calculate the RGB Value of a code in the 6 x 6 x 6 color cube, the following code can be used:
<syntaxhighlight lang="python" line>
# print a list of the 256-color red/green/blue values used by xterm.
#
# reference:
# https://github.com/ThomasDickey/ncurses-snapshots/blob/master/test/xterm-16color.dat
# https://github.com/ThomasDickey/xterm-snapshots/blob/master/XTerm-col.ad
# https://github.com/ThomasDickey/xterm-snapshots/blob/master/256colres.pl

print("colors 0-16 correspond to the ANSI and aixterm naming")
for code in range(0, 16):
    if code > 8:
        level = 255
    elif code == 7:
        level = 229
    else:
        level = 205
    r = 127 if code == 8 else level if (code & 1) != 0 else 92 if code == 12 else 0
    g = 127 if code == 8 else level if (code & 2) != 0 else 92 if code == 12 else 0
    b = 127 if code == 8 else 238 if code == 4 else level if (code & 4) != 0 else 0
    print(f"{code:3d}: {r:02X} {g:02X} {b:02X}")

print("colors 16-231 are a 6x6x6 color cube")
for red in range(0, 6):
    for green in range(0, 6):
        for blue in range(0, 6):
            code = 16 + (red * 36) + (green * 6) + blue
            r = red   * 40 + 55 if red   != 0 else 0
            g = green * 40 + 55 if green != 0 else 0
            b = blue  * 40 + 55 if blue  != 0 else 0
            print(f"{code:3d}: {r:02X} {g:02X} {b:02X}")

print("colors 232-255 are a grayscale ramp, intentionally leaving out black and white")
code = 232
for gray in range(0, 24):
    level = gray * 10 + 8
    code = 232 + gray
    print(f"{code:3d}: {level:02X} {level:02X} {level:02X}")
</syntaxhighlight>

There has also been a similar but incompatible 88-color encoding using the same escape sequence, seen in {{code|rxvt}} and {{code|xterm-88color}}.<ref>{{cite web |url=https://invisible-island.net/ncurses/ncurses.faq.html#xterm_256color |title=Ncurses FAQ: Why not make "xterm" equated to "xterm-256color"? |author-first=Thomas E. |author-last=Dickey |accessdate=March 28, 2025}}</ref>  It uses a 4×4×4 color cube.

==== 24-bit ====

As "true color" graphic cards with 16 to 24 bits of color became common, applications began to support 24-bit colors. Terminal emulators supporting setting 24-bit foreground and background colors with escape sequences include Xterm,<ref name="xtc"/> KDE's [[Konsole]],<ref>{{cite web |url=https://quickgit.kde.org/?p=konsole.git&a=blob&f=tests%2Fcolor-spaces.pl |title=color-spaces.pl (a copy of 256colors2.pl from xterm dated 1999-07-11) |publisher=KDE |date=2006-12-06 }}{{Dead link|date=June 2020 |bot=InternetArchiveBot |fix-attempted=yes }}</ref><ref>{{cite web |url=https://invent.kde.org/personalizedrefrigerator/konsole/-/blob/master/doc/user/README.moreColors |title=README.moreColors |publisher=KDE |date=2010-04-22 }}</ref> and iTerm, as well as all libvte based terminals,<ref>{{cite web |url=https://bugzilla.gnome.org/show_bug.cgi?id=704449 |title=libvte's bug report and patches: Support for 16 million colors |publisher=GNOME Bugzilla |date=2014-04-04 |access-date=2016-06-05}}</ref> including [[GNOME Terminal]].<ref>{{cite web|url=https://askubuntu.com/questions/512525/how-to-enable-24bit-true-color-support-in-gnome-terminal|title=How to enable 24bit true color support in Gnome terminal?}}</ref>
 ESC[38;2;{{angbr|r}};{{angbr|g}};{{angbr|b}}m Select RGB foreground color
 ESC[48;2;{{angbr|r}};{{angbr|g}};{{angbr|b}}m Select RGB background color

The syntax is likely based on the [[ITU]]'s T.416 [[Open Document Architecture]] (ODA) and interchange format: Character content architectures,<ref name="T.416"/> which was adopted as ISO/IEC 8613-6 but ended up as a commercial failure.{{cn|date=February 2022}} The ODA version is more elaborate and thus incompatible:
* The parameters after the '2' (r, g, and b) are optional and can be left empty.
* Semicolons are replaced by colons, as above. 
* There is a leading "colorspace ID".<ref name="xtc"/> The definition of the colorspace ID is not included in that specification, so it may be blank to represent the unspecified default. For CMYK color specifications, mintty interprets the colorspace ID parameter as specifying the maximum value which the channel values are given out of (e.g. 100 or 255).<ref name="mintty"/>
* In addition to the '2' value after 48 to specify a Red-Green-Blue format (and the '5' above for a 0-255 indexed color), there are alternatives of '0' for implementation-defined and '1' for transparent - neither of which have any further parameters; '3' specifies colors using a Cyan-Magenta-Yellow scheme, and '4' for a Cyan-Magenta-Yellow-Black one, the latter using the position marked as "unused" for the Black component.<ref name="T.416"/>
 ESC[38:2:{{angbr|Color-Space-ID}}:{{angbr|r}}:{{angbr|g}}:{{angbr|b}}:{{angbr|unused}}:{{angbr|[[Color difference|CS tolerance]]}}:{{angbr|Color-Space}}m Select RGB foreground color
 ESC[48:2:{{angbr|Color-Space-ID}}:{{angbr|r}}:{{angbr|g}}:{{angbr|b}}:{{angbr|unused}}:{{angbr|CS tolerance}}:{{angbr|Color-Space}}m Select RGB background color
where {{code|Color-Space}} indicates the Color-Space associated with the given tolerance: {{code|0}} for CIELUV or {{code|1}} for CIELAB.

The ITU-RGB variation is supported by xterm, with the colorspace ID and tolerance parameters ignored. The simpler scheme using semicolons is initially found in Konsole.<ref name="xtc"/>{{rp|at=Can I set a color by its number?}}

==== Unix environment variables relating to color support ====

Rather than using the color support in termcap and terminfo introduced in SVr3.2 (1987),<ref>{{cite manual |url=https://invisible-island.net/ncurses/man/curs_color.3x.html#h2-HISTORY |section=History |title=curs_color(3X) - manipulate terminal colors with curses }}</ref> the S-Lang library (version 0.99-32, June 1996) used a separate environment variable {{code|$COLORTERM}} to indicate whether a terminal emulator could use colors at all, and later added values to indicate if it supported 24-bit color.<ref>{{cite web |title=Midnight Commander: lib/tty/color-slang.c|website=Fossies |url=https://fossies.org/linux/mc/lib/tty/color-slang.c}}</ref><ref name=ncurses-on-slang>{{cite web |first=Thomas E. | last=Dickey |title=NCURSES — comments on S-Lang |url=https://invisible-island.net/ncurses/ncurses-slang.html |year=2017 |website=invisible-island.net}}</ref> This system, although poorly documented, became widespread enough for Fedora and RHEL to consider using it as a simpler and more universal detection mechanism compared to querying the now-updated libraries.<ref>{{cite web |title=Features/256 Color Terminals - Fedora Project Wiki |url=https://fedoraproject.org/wiki/Features/256_Color_Terminals#Scope |website=Fedora Project |archive-url=https://web.archive.org/web/20121004184942/https://fedoraproject.org/wiki/Features/256_Color_Terminals#Scope|archive-date=4 October 2012|url-status=live}}</ref>

Some terminal emulators (urxvt, konsole) set {{code|$COLORFGBG}} to report the color scheme of the terminal (mainly light vs. dark background). This behavior originated in S-Lang<ref name=ncurses-on-slang/> and is used by vim. Gnome-terminal refuses to add this behavior, as the syntax for the value is not agreed upon, the value cannot be changed upon a runtime change of the palette, and more "proper" xterm OSC 4/10/11 sequences already exist.<ref>{{cite web |title=Bug 733423 – Please set COLORFGBG environment variable for automatic color detection |url=https://bugzilla.gnome.org/show_bug.cgi?id=733423 |website=bugzilla.gnome.org}}</ref>