Editing ANSI escape code (section)

==== 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?}}