[Poppler-bugs] [Bug 5589] image scaling with cairo is poor quality

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=5589





--- Comment #65 from Carlos Garcia Campos <carlosgc at gnome.org>  2010-01-23 02:37:25 PST ---
(In reply to comment #64)
> (In reply to comment #62)
> > Created an attachment (id=32750)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=32750) [details] [details]
> > Patch based on pixman patches
> > 
> > I finally have a patch based on the patches that Jeff proposed for pixman.
> > Could you confirm this patch works for your test cases, please?
> > 
> 
> I tested a few files and it seems to work fine. However rendering speed is
> reduced considerably compared to my patched setup. :-(

Yes, but theoretically it gives better results. There are three algorithms in
Jeff's patches: integer-box, box and lanczos. The first one is the fastest but
it gives the worst quality, lanczos provides the highest quality but it's
slower than the others. Jeff suggested me to use box since it provides quite
good quality with a reasonable performance. 

> Did you test printing? I don't have one.
> 

The problem is only in the image backend, so we don't use it when printing. 


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