Reduceing colors in the Alpha layer

["Andrew R." <forums@xxxxxxxxxxxxx>]

How do I change the png plug in?




>Hi,
>
>On Wed, 2008-12-17 at 10:35 +0200, Francois du Toit wrote:
>> On Tue, Dec 16, 2008 at 5:32 AM, David Gowers <00ai99@xxxxxxxxx> 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...
>
>
>Sven
>
>
>

-- 
Andrew R.
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