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Support rgbgfx -c dmg to imply -c dmg=e4

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Fixes #1776
This commit is contained in:
Rangi42
2025-08-05 14:18:25 -04:00
parent 504a45a4ed
commit a3983b7b0f
5 changed files with 21 additions and 3 deletions
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7
man/rgbgfx.1
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@@ -178,6 +178,13 @@ the low two bits 0-1 specify which gray shade goes in color index 0,
the next two bits 2-3 specify which gray shade goes in color index 1,
and so on.
Gray shade 0 is the lightest (white), 3 is the darkest (black).
If
.Ar pal_spec
is the case-insensitive word
.Cm dmg ,
then it acts like
.Cm dmg=E4 ,
i.e. the darkest gray will end up in color index 0, and so on.
The same gray shade cannot go in two color indexes.
To specify a DMG palette, the input PNG must have all its colors in shades of gray, without any transparent colors.
.It Sy automatic palette generation