[Mono-dev] Transparency from GIF files does not show up in BitmapData

Christian Stümpel mail at christian-stuempel.de
Tue Feb 26 10:20:21 EST 2008

Hi everybody ,

since I got no reply I post this again. Please help...

my program analyzes System.Drawing.Bitmaps. Many pixel formats (all- 
non indexed, some indexed) work fine, but in BitmapData of Bitmaps  
from GIF image files which use transparent color I cannot find the  
transparency information anywhere. From the source code I guessed  
that the transparent index would get transformed into an ColorPalette  
entry which has the alpha component set correctly.  But all palette  
entries  are opaque.

A problem with the GIF decoder maybe? Any ideas?

Christian Stuempel

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