Bug 50995

Summary:	poppler-glib/cairo does not antialias text in some PDFs, while okular does
Product:	poppler	Reporter:	Fabian Henze <flyser42>
Component:	cairo backend	Assignee:	poppler-bugs <poppler-bugs>
Status:	RESOLVED MOVED	QA Contact:
Severity:	normal
Priority:	medium	CC:	dmitri.chubarov, flyser42
Version:	unspecified
Hardware:	x86-64 (AMD64)
OS:	Linux (All)
Whiteboard:
i915 platform:		i915 features:
Attachments:	the problematic PDF (shortened. used to be 15MB in size)

Description Fabian Henze 2012-06-12 01:04:02 UTC

Hi,
I have found a PDF file, which looks horrible when rendered with poppler-glib or pdftocairo. It does render (mostly) fine in okular, so I guess it's either specific to poppler-glib or the cairo backend.

You can reproduce that bug with:
pdftocairo -png -r 90 -f 15 -l 20 exphy.pdf
or with Evince.

I am using archlinux with poppler 0.20.0 and cairo 1.12.2, but it also happens on a gentoo system with 0.18.4 and 1.10.2.

Best regards,
Fabian Henze

P.S.: I also experiences crashes when rendering this PDF file to a cairo PDFSurface, but only if I would use poppler_page_render() instead of render_for_printing().

Comment 1 Fabian Henze 2012-06-12 01:08:58 UTC

Created attachment 62919 [details]
the problematic PDF (shortened. used to be 15MB in size)

Comment 2 Dmitri Chubarov 2015-07-07 13:15:10 UTC

The problem is with rendering bitmap fonts (e.g. TeX Type 3 fonts), or embedded black and white images, such as scanned images. Some 5 years ago there was a discussion of this on Ubuntu launchpad with a few examples that are still displayed without antialiasing in poppler/cairo even using poppler 0.26.5.

https://bugs.launchpad.net/ubuntu/+source/poppler/+bug/248355/comments/52

Comment 3 GitLab Migration User 2018-08-21 11:03:29 UTC

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