On 21/10/2020 04:35, debian-testing wrote:
> What version of gscan2pdf and imagemagick are you using to reproduce the
> problem? It has to be recent versions on Debian 11 and the scan or image
> also needs to be 600dpi (300 dpi is fast).
Thanks. This was the detail that allowed me to reproduce
Yes, the mageMagick issue #1819
(https://github.com/ImageMagick/ImageMagick/issues/1819) discusses performance
also. See the following quotes: "...the dithering step takes so long that I
haven't had the patience to let it finish yet...", "...Not sure why it is doing
very slow dithering...",
Thanks for the report.
https://github.com/ImageMagick/ImageMagick/issues/1819
doesn't mention performance problems, just corruption in the image.
I can't reproduce your problem. The threshold tool works fine for me
with or without conversion to PNG first.
Please start gscan2pdf from the
Package: gscan2pdf
Version: 2.8.2-1
Threshold function is extremely slow - Unusable - Possible regression
Applying threshold on a scanned image is extremely slow. Doing the same
transformation using mogrify/convert is many times faster. This seems to be a
regression during the last few months
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