Bug 20143

Summary:	uneven font rendering
Product:	poppler	Reporter:	Maciej Pilichowski <bluedzins>
Component:	splash backend	Assignee:	poppler-bugs <poppler-bugs>
Status:	RESOLVED FIXED	QA Contact:
Severity:	normal
Priority:	medium	CC:	desintegr
Version:	unspecified
Hardware:	Other
OS:	All
Whiteboard:
i915 platform:		i915 features:
Attachments:	example pdf okular, fit page zoom okular, zoom in kpdf, zoom in kpdf-a okular-a

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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