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sumatrapdfreader / sumatrapdf

SumatraPDF reader
http://www.sumatrapdfreader.org
GNU General Public License v3.0
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Extended display mode on external monitor shows blurry contents #1217

Open zengxu-yang opened 5 years ago

zengxu-yang commented 5 years ago

I encountered some issues of Sumatra PDF recently. I tested on two laptop computers with an external 15.6 inch display of 3200x1800 native resolution (235 dpi) connected by an HDMI cable. Under the "Show only on 2" mode, Sumatra on the external display can show the pdf file using the optimal resolution which is very sharp. But when using "Extend these displays" mode then Sumatra PDF on the external display shows noticeably more blurry contents. I tried to open the same pdf file with Microsoft Edge or Google Chrome, no blurriness is observed in either mode, which shows that it is not a hardware or system software issue.

Both laptop computers run Windows 10 Home and the native resolution of their own displays are 2160x1440 and 1920x1080. Sumatra PDF version is v3.2 installed from Microsoft Store. The external display is set at its optimal resolution of 3200x1800 in Windows Display Settings. I noticed that the second computer shows more blurry contents in Sumatra PDF with "Extend these displays" mode.

I'm testing a PDF file with a lot of mathematical formulas and diagrams. The test file can be downloaded at https://assets.ctfassets.net/r1dr6vzfxhev/2t4uxvsIqk0EUau6g2sw0g/45eae33637ca92f85dd9f4a3a218e1ec/iota1_4_3.pdf

zengxu-yang commented 5 years ago

Additional information: I'm using the external monitor with portrait mode. With a 235 dpi resolution, even the tiny fonts and symbols should be very sharp and clear when reading from a distance about 50 cm. The optimal resolution should match the resolution of retina.

GitHubRulesOK commented 4 years ago

@zengxu-yang Please do not expect support for the microsoft store copycats even if you paid $19.99 or got the free one they are NOT official and have known security bugs. Please test the latest safe version from here https://www.sumatrapdfreader.org/dailybuilds.html then report your findings with dual screen-grab if possible

M4rkoKoo commented 1 year ago

I have the same problem in Windows 11 and SumatraPdf v3.4.6 53-bit. Changing the font does not help.