On Wed, 2008-12-17 at 10:35 +0200, Francois du Toit wrote:
> On Tue, Dec 16, 2008 at 5:32 AM, David Gowers <00a...@gmail.com> wrote:
> > PNG actually supports indexed images with full 8bit alpha channel. If
> > Flash supports that, it could be worth your while to look into.
> But does gimp support indexed images with full 8bit alpha channel?
Yes, it does. With some caveats (see below).
> Converting an image to indexed also converts the alpha channel to 1bit
> in some quick tests.
That observation is wrong. It's just the display that shows the image as
if the alpha channel only had 1 bit. This is a historical decision, made
to make it easier to work with GIF files. The alpha channel is actually
kept intact. The PNG save plug-in does not support saving indexed images
with full 8bit alpha channel though. If you really need this feature, it
shouldn't be too difficult to improve support for it in GIMP. Perhaps
start by changing the PNG plug-in...
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