On 02.07.2012 02:49, temp-user wrote:

I used to convert them to indexed so their size would be reduced. Since I 
installed a new version, the semi-transparency is cut off and I have just plain 
black on transparent background as if there were no antialiasing, very ugly.

I too used to use the ability to create indexed color pngs with semi-ransparent 
this ability seems to have been either removed, lost or broken in the more 
recent release of gimp.

the png format can support it but it looks like gimp just does indexed color 
conversion  in a very GIF-like way.

GIMP has no support for this - there's an ancient bug report about allowing real alpha channels in indexed files, see https://bugzilla.gnome.org/show_bug.cgi?id=86627

The PNG plug-in should load the alpha channel from an indexed PNG file, but you'll have to et the mode to RGB in order to make use of it.

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