Photini bug "cannot cast to unsigned bytes"

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Jim Easterbrook

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Jan 20, 2026, 5:08:28 AMJan 20
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Friends,

With some versions of PyQt6 Photini cannot display image thumbnails, and
logs an error "thumbnail: memoryview: cannot cast to unsigned bytes if
the format flag is present".

The next release of Photini will fix this, but in the meantime you can
try using PyQt5 or PySide6 or PySide5 instead of PyQt6.
https://photini.readthedocs.io/en/latest/manual/configuration.html

See https://github.com/jim-easterbrook/Photini/issues/330 for more info.

--
Jim Easterbrook <http://www.jim-easterbrook.me.uk/>

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