[Poppler-bugs] [Bug 22138] [PATCH] Image quality worse compared to Adobe Reader

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=22138

--- Comment #34 from Thomas Freitag <Thomas.Freitag at alfa.de> ---
(In reply to comment #31)
> Thanks for the patch Adrian, i'll try to have a look to squeeze it in before
> the 0.22 beta 2 this thursday.
> 
> Thomas, as Splash guru, can you give it a quick look too?

I hadn't a look the algorithm itself and I didn't test the patch. You should
see in Your regtest if it has the desired result. But what I can say is that it
replaces the correct function: it is called only when there is an upscale in
both dimensions (x and y), and hopefully here we get a better quality. So one
hint for Your tests: You should render some PDF with images at least with 300
dpi. With 150 dpi this function in splash is seldom called, because most images
inside Your PDF Suite have at least 150 dpi (as far as I remember).
And just to be complete: for downscaling an image it isn't necessary, there the
Bresenham algorithm is well enough, so the patch should do what is expected.
So in my eyes the patch is okay!

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