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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #30 from Adrian Johnson <ajohnson at redneon.com> ---
Created attachment 70258
  --> https://bugs.freedesktop.org/attachment.cgi?id=70258&action=edit
Implement bilinear scaling

Here's a proof of concept of implementing bilinear scaling in
Splash::scaleImageYuXu. Testing with the two pdfs test cases in this bug shows
a big improvement. The quality is about the same as the cairo output (which
also uses bilinear scaling). Performance is slightly slower than before but the
patch has plenty of scope for optimizing (such as moving the SplashMode switch
to work on the source row).

If you are interested in this I can continue to work on it.

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