[gs-bugs] [Bug 690487] Issues with transparency and GraphicsAlphaBits

[bugzilla-daemon at ghostscript.com]

http://bugs.ghostscript.com/show_bug.cgi?id=690487

--- Comment #15 from Michael Vrhel <michael.vrhel at artifex.com> 2010-05-07 16:51:17 UTC ---
I should have a fix for this shortly but I need to do a bit of testing.  It
appears that simply initializing the pattern bit buffer to white, fixes the
issue since we are then not accessing uninitialized data during the pattern
get_bits operation when we are in the gx_default_copy_alpha operation.  One
thing I have observed is that using alphabits when the output device is CMYK
based for this file results in wrong colors.  I want to take a quick look at
that issue too.  It appears to me that gx_default_copy_alpha has problems with
respect to this.

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