[gs-bugs] [Bug 689934] pngalpha device doesn't write full white background

[bugs.ghostscript.com-bugzilla-daemon at ghostscript.com]

http://bugs.ghostscript.com/show_bug.cgi?id=689934





------- Additional Comments From gsview at ghostgum.com.au  2008-07-04 17:57 -------
Using "full white transparent" gives the same pixel value as gx_no_color_index.
>From memory, this caused problems, hence the pngalpha device uses almost white 
instead.  I would need to test it to see if ghostscript allows you to set a 
pixel value to gx_no_color_index.

The current behaviour shouldn't affect the final render, because the pixels 
are transparent, and so should take on the colour of the background.  There 
will only be a problem if the final render is buggy and doesn't recognised 
transparent pixels.

One possible kludge would be to redefine the copy page routine to convert the 
untouched pixels to full white transprent at the end.





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