[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 #37 from Huug <dsjarw at gmail.com>  2009-11-17 13:24:34 PST ---
(In reply to comment #36)
Thanks for your comments

-Regarding presentation: you're probably right. I'm pretty much clueless here.
Please let someone in the know (yourself?) fix this to get this patch accepted.
For someone who has done this already this shouldn't take much time. I would
have to install git, read the man pages etc, probably only to realize nobody is
interested in this patch.

-I think this or any other fix should be implemented asap since it renders a
lot of pdf readers useless when scanned documents must be read.(e.g. all older
scientific papers). I had to install acrobat reader on Ubuntu. This is
ludicrous.

-As for the pixman implementation. This might be better, but performance wise I
wouldn't expect too much from it because this filtering just doesn't take very
long compared to all the other processes. If you are interested in speed it
might be worthwhile to write a separate one bit drawimage function. The
majority of the the scanned documents are one bit (b/w). In the current
implementation the one bit stream is converted to a byte stream then to a ARGB
image and then prescaled which is a roundabout way of doing this.


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