Editing PCX (section)

===Image data layout===
PCX image data is stored in rows or scan lines in top-down order. If the image has multiple planes, these are stored by plane within row, such that all the red data for row 0 are followed by all the green data for row 0, then all the blue data, then alpha data. This pattern is repeated for each line as shown in the next table:

{| class="wikitable" 
|+ PCX Image Data Arranged into Color Planes
|-
|align="center" width="60" rowspan="4"| Row 0
|align="center" style="background:#ffafaf;font-family: monospace"| R R R R R R R R R
|-
|align="center" style="background:#afffaf;font-family: monospace"| G G G G G G G G G
|-
|align="center" style="background:#afafff;font-family: monospace"| B B B B B B B B B
|-
|align="center" style="background:#cfcfcf;font-family: monospace"| A A A A A A A A A
|-
|align="center" rowspan="4"| Row 1
|align="center" style="background:#ffafaf;font-family: monospace"| R R R R R R R R R
|-
|align="center" style="background:#afffaf;font-family: monospace"| G G G G G G G G G
|-
|align="center" style="background:#afafff;font-family: monospace"| B B B B B B B B B
|-
|align="center" style="background:#cfcfcf;font-family: monospace"| A A A A A A A A A
|-
|align="center" style="height:64px"| Row 2 etc.||align="center"| ....
|}

When an image is less than 8 bits per pixel, each line is padded to the next even byte boundary.<ref name=":1" /> For example, if an image has 1 plane of 1-bit data (monochrome) with a width of 22 pixels, each row will be 4 bytes long, having 32 bits per row with 10 bits unused.