FTR: I found the culprit in the image mentioned above (resize.gif) and our FLTK decoder. The problem is that ColorMapSize == 2 (i.e. 0, 1) but the transparent color index is set to 2, i.e. beyond the existing colormap. Our current code could not deal with this. My new code extends the colormap and now it works. :-)

Here is an image of the resultant display in FLTK with:

• window background: light yellow
• image box background: pink
• hence transparent pixels are pink

Next step: clean up code and commit...

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