[gs-bugs] [Bug 691305] Touched areas not rendered properly

bugzilla-daemon at ghostscript.com bugzilla-daemon at ghostscript.com
Sat May 15 15:03:43 UTC 2010


--- Comment #8 from Ken Sharp <ken.sharp at artifex.com> 2010-05-15 15:03:40 UTC ---
(In reply to comment #7)
> Thank you very much for explanations.
> Transparency:
> I'm using pngalpha device. The documentation says:
> "The pngalpha device is 32-bit RGBA color with transparency indicating pixel
> coverage. The background is transparent unless it has been explicitly filled.
> PDF 1.4 transparent files do not give a transparent background with this
> device. Text and graphics anti-aliasing are enabled by default."
> I also was not able to change background color with option 
> -dBackgroundColor=16#CCCC00
> I think in older versions of Ghostscript this works properly.

Ummm, well I'm not enough of a PNG expert to be able to tell. 

Its possible this is the same issue as reported in bug #690508, see comment #4.
This suggests to me that the pngalpha device has not been updated to handle
fillpage, I suspect it thinks the initial filling of the page is a fill with
white, hence no transparent background. Since -dBackgroundColor only has an
effect if the background is transparent, that may well be working, but not
having any effect as there is no transparency.

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