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http://www.openoffice.org/issues/show_bug.cgi?id=69438





------- Additional comments from [EMAIL PROTECTED] Mon Sep 11 00:44:27 -0700 
2006 -------
Aplha transparency is possible only for true color images, so only for PNG using
truecolor.
Indexed images, like GIF or PNG with 256 colors, have only solid transparency.

solid transparency = one color from the palette is assigned to transparency, a
pixel can be either transparent or opaque
alpha transparency = the image have one additional channel, is represented as
RGBA (RGB + Alpha), so it has the possibility of 256 degrees of transparecny (at
least for PNG)

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