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Old 06-07-2016, 05:46 AM   #1
diolu
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Wrong kerning between letters in pdf export

I try to convert an epub ebook to a printable pdf. The problem is that the kerning (spaces between letters) is bad. Some letters are too close to each other and the overall look is really uneven. This happen with many ebooks and fonts, for example the introduction ebook (that come with Calibre) to pdf with default values. Note that I have seen this problem with many word processors as well (but not with Libreoffice that do it right).

I am using Calibre in Archlinux. Both the official binary version and the version distributed by Archlinux are affected.
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Old 06-07-2016, 06:02 AM   #2
kovidgoyal
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Turn off font hinting in your fontconfig preferences.
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Old 06-07-2016, 06:20 AM   #3
diolu
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Quote:
Originally Posted by kovidgoyal View Post
Turn off font hinting in your fontconfig preferences.
The kerning are wrong in the pdf, as seen on the screen (with very large magnification to examine the problem) as well as printed. Font hinting is only a technology to display character on the screen. It does not change what come out of the printer nor the spacing between letters when using a large magnification.
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Old 06-07-2016, 06:34 AM   #4
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Sigh, the font hinting in question affects the generation of the PDF, not its display.

https://bugreports.qt.io/browse/QTBUG-44488
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Old 06-08-2016, 05:37 AM   #5
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You are right. Disabling font hinting solves the problem. Not very handy because I have to disable it global wide each time I would like to make a pdf conversion, but it works
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