[josm-dev] JOSM Mappaint and PNG's without alpha channel

[Dirk Stöcker]

Hello,

a recent image ompimization of the mappaint icons showed that JOSM has a 
strange behaviour related to the existence of an alpha channel.

a) If there is an alpha channel it is used for transparency.
b) If there is no alpha channel, the background color is used as alpha channel.

Now the image optimizer removed the alpha channel for all icons, where is 
empty and josm then switched to mode b which caused some ugly looking 
icons.

The question is, how can I force it to handle "no alpha channel" 
effectively as "no alpha channel" and not as "background color alpha 
channel"? I did not really find anything related to this topic in the Java 
docs.

Ciao
-- 
http://www.dstoecker.eu/ (PGP key available)