[Poppler-bugs] [Bug 47706] Exporting pdf from LibreOffice with smooth gradient displays striped in Evince, shows correctly in Adobe Reader

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=47706

--- Comment #5 from Adrian Johnson <ajohnson at redneon.com> 2012-03-23 15:41:08 PDT ---
(In reply to comment #1)
> The shadings are split into chunks; the chunks are rendered with blank
> space between.
> 
> Another example (this is a type 7 shading, converted from ps by gs):
> 
>   http://jhcloos.com/PostScript/XYZsweep.pdf

This is not quite the same as the LibreOffice PDF. The LibreOffice PDF is
emulating a gradient by drawing series of rectangles. XYZsweep contains a
native PDF gradient. The seams in the cairo rendering of XYZsweep have been
fixed with the release of cairo 1.12 which supports Type 6/7 gradients.

XYZsweep.pdf is an interesting test case. Cairo (using cairo 1.12 and poppler
master) renders this almost the same as acroread while splash renders it
similar to ghostscript with a much larger pink area in the bottom right. I'm
not sure which is correct. Printing the file as a PDF to my printer (I don't
know who makes the PDF interpreter for Xerox printers) results in the same
output as acroread. After printing the file to PS using acroread, ghostscript
still renders it the same with the larger pink area but my printer (Adobe PS
interpreter) gets it wrong with large blob of dark blue on the bottom right.

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