[boost] [gil]:support for png palette images

From: Andreas Pokorny (andreas.pokorny_at_[hidden])
Date: 2007-11-04 10:34:10

Hello,

I just stumbled across missing support for PNG_COLOR_TYPE_PALETTE
in gil. Somehow most monochrome images e.g. generated with gimp
use PNG_COLOR_TYPE_PALETTE with two colors, instead of _GRAY
with a bit depth of one.

So I thought, maybe someone else already added support for such
files?

regards
Andreas