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Comparing rxvt-unicode/doc/rxvt.1.pod (file contents):
Revision 1.245 by root, Wed Jun 17 11:59:37 2015 UTC vs.
Revision 1.246 by sf-exg, Tue Jun 21 12:03:55 2016 UTC

… …
1595In addition to the default foreground and background colours, 1595In addition to the default foreground and background colours,
1596B<@@RXVT_NAME@@> can display up to 88/256 colours: 8 ANSI colours plus 1596B<@@RXVT_NAME@@> can display up to 88/256 colours: 8 ANSI colours plus
1597high-intensity (potentially bold/blink) versions of the same, and 72 (or 1597high-intensity (potentially bold/blink) versions of the same, and 72 (or
1598240 in 256 colour mode) colours arranged in an 4x4x4 (or 6x6x6) colour RGB 1598240 in 256 colour mode) colours arranged in an 4x4x4 (or 6x6x6) colour RGB
1599cube plus a 8 (24) colour greyscale ramp. 1599cube plus a 8 (24) colour greyscale ramp.
1600
1601B<@@RXVT_NAME@@> supports direct 24-bit fg/bg RGB colour escapes
1602C< ESC [ 38 ; 2 ; R ; G ; Bm > / C< ESC [ 48 ; 2; R ; G ; Bm >. However the
1603number of 24-bit colours that can be used is limited: an internal 7x7x5 (256
1604colour mode) or 6x6x4 (88 colour mode) colour cube is used to index into the
160524-bit colour space. When indexing collisions happen, the nearest old colour in
1606the cube will be adapted to the new 24-bit RGB colour. That means one cannot
1607use many similar 24-bit colours. It's typically not a problem in common
1608scenarios.
1600 1609
1601Here is a list of the ANSI colours with their names. 1610Here is a list of the ANSI colours with their names.
1602 1611
1603=begin table 1612=begin table
1604 1613

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