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Never output jbig2 #10

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hfiguiere opened this issue Sep 21, 2022 · 3 comments
Open

Never output jbig2 #10

hfiguiere opened this issue Sep 21, 2022 · 3 comments

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@hfiguiere
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djpdf should never use jbig2 to compress. While JBIG2 compression is good, it can produce erroneous document by substituting one shape with another:

See https://en.wikipedia.org/wiki/JBIG2#Disadvantages and the associated references.
@Unrud
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Unrud commented Sep 25, 2022

A warning message for JBIG2 is already displayed. This should only be a problem with very low DPI values compared to the character size.
To further mitigate the problem, I raised the default threshold for JBIG2 from 85% to 90% and added customizable defaults.

@hfiguiere
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ever saw a warning (at least in the UI)

@hfiguiere
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with the default settings:

before:
Screenshot from 2023-01-31 08-40-08

after:
Screenshot from 2023-01-31 08-40-34

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@hfiguiere @Unrud