From: Jimka
Subject: need to swap white and black
Date: Sun, 23 Jul 2006 10:21:42 +0000
Message-ID: <1153650102.900991.143150@i3g2000cwc.googlegroups.com>

I'd like to exchange white and black in a large number of png
graphics files.   Each png has a very simply color pallet of 10 to
20 colors but each file's pallet might be different.

Can anyone think of an easy way to do this?  I was considering using
the cl-gd package, but there might be a much easier way with some
sort of command line interface to image magick or gimp.

-jim

From: Lars Rune Nøstdal
Subject: Re: need to swap white and black
Date: Sun, 23 Jul 2006 18:40:32 +0000
Message-ID: <1153680032.782591.281250@h48g2000cwc.googlegroups.com>

Jimka wrote:
> I'd like to exchange white and black in a large number of png
> graphics files.   Each png has a very simply color pallet of 10 to
> 20 colors but each file's pallet might be different.
>
> Can anyone think of an easy way to do this?  I was considering using
> the cl-gd package, but there might be a much easier way with some
> sort of command line interface to image magick or gimp.
>
> -jim

What about these http://www.cliki.net/graphics%20library ..? Maybe
http://common-lisp.net/project/imago/

-- 
mvh, Lars Rune Nøstdal
http://lars.nostdal.org/