Bug 20143 - uneven font rendering
Summary: uneven font rendering
Status: RESOLVED FIXED
Alias: None
Product: poppler
Classification: Unclassified
Component: splash backend (show other bugs)
Version: unspecified
Hardware: Other All
: medium normal
Assignee: poppler-bugs
QA Contact:
URL:
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2009-02-16 09:40 UTC by Maciej Pilichowski
Modified: 2009-10-07 14:48 UTC (History)
1 user (show)

See Also:
i915 platform:
i915 features:


Attachments
example pdf (7.43 KB, application/pdf)
2009-02-16 09:41 UTC, Maciej Pilichowski
Details
okular, fit page zoom (62.70 KB, image/png)
2009-02-16 09:42 UTC, Maciej Pilichowski
Details
okular, zoom in (215.88 KB, image/png)
2009-02-16 09:43 UTC, Maciej Pilichowski
Details
kpdf, zoom in (229.58 KB, image/png)
2009-02-16 09:44 UTC, Maciej Pilichowski
Details
kpdf-a (463 bytes, image/png)
2009-02-25 23:38 UTC, Maciej Pilichowski
Details
okular-a (420 bytes, image/png)
2009-02-25 23:38 UTC, Maciej Pilichowski
Details

Description Maciej Pilichowski 2009-02-16 09:40:58 UTC
Comes from:
http://bugs.kde.org/show_bug.cgi?id=184442

Wish/bug?

The problem is related to all pdf generated with latex.

Consider letter U, in kpdf I see vertical lines like
|  |
when I zoom in I see
||  ||
they are thicker.

In Okular it is different, it is always something like this:
||  |
one thick, one thin. Also the are other effects, like in small zoom, I see text
quite clearly, I zoom in, and the quality is worse -- some lines (of the font)
are super thick -- like horizontal dash in "e".

Only in huge zoom Okular quality is on par with kpdf.

Ss follows, note the in first ss the small letter "s", how ugly this is rendered. In zoom in compare okular and kpdf -- letter "a", in kpdf the "a" is "open", when in okular "a" is almost closed.

Btw. now I see that poppler is based on xpdf, and xpdf had bad rendering since I remember, so it is not new problem (i.e. related to this or that frontend).
Comment 1 Maciej Pilichowski 2009-02-16 09:41:54 UTC
Created attachment 22983 [details]
example pdf
Comment 2 Maciej Pilichowski 2009-02-16 09:42:43 UTC
Created attachment 22984 [details]
okular, fit page zoom
Comment 3 Maciej Pilichowski 2009-02-16 09:43:46 UTC
Created attachment 22985 [details]
okular, zoom in
Comment 4 Maciej Pilichowski 2009-02-16 09:44:37 UTC
Created attachment 22986 [details]
kpdf, zoom in
Comment 5 Maciej Pilichowski 2009-02-16 09:45:49 UTC
Versions:
opensuse 11.1
KDE 3.5.10
kde4-okular-4.2.0-71.8
libpoppler-qt4-3-0.10.1-1.4
libpoppler4-0.10.1-1.4
poppler-tools-0.10.1-1.4
libpoppler-glib4-0.10.1-1.4
libpoppler-qt2-0.10.1-1.4
libqt4-4.4.3-4.7
Comment 6 Albert Astals Cid 2009-02-25 15:10:55 UTC
I've have to sincerely admit i can't see any of the problems you mention in the attached screenshots, can you attach newer ones painting over them and pointing the problems exactly?
Comment 7 Maciej Pilichowski 2009-02-25 23:38:29 UTC
Created attachment 23305 [details]
kpdf-a
Comment 8 Maciej Pilichowski 2009-02-25 23:38:55 UTC
Created attachment 23306 [details]
okular-a
Comment 9 Maciej Pilichowski 2009-02-25 23:40:58 UTC
OK, so step by step. I added comparison between okular "a" and kpdf "a". Notice that in okular the "cap" of a almost closes the letter (it touches bottom "o"). In kpdf the letter is more open, thus more clear while zooming in/out.

The pdf file is of course the same (single file).
Comment 10 Albert Astals Cid 2009-10-07 14:48:49 UTC
Should be fixed in poppler >= 0.12.1 please reopen if you still feel rendering is bad


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