06-14-2022, 08:40 AM | #1 |
LivresInOz
Posts: 330
Karma: 15956
Join Date: May 2010
Device: Kobo: Forma + Libra|Galaxy: TAB A7 + Note 8 tablet|Boox: Note Air 2
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Koreader: improved rendering of PDFs with background shading?
Some of you may have seen PDFs that have pages that are not pure white, but have some kind of 'shade', usually because they have been copied from a hardcopy book.
These tend to load very slowly. Almost unusable actually. Of course one can use an OCR program to convert them and remove the background. But I was wondering if there was any setting in Koreader that might do the same? For example I notice settings like 'remove watermark', dithering and so on. I thought there MIGHT be something that allowed you to ignore the background 'colour'. |
06-15-2022, 06:51 AM | #2 |
Wizard
Posts: 1,619
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Join Date: Oct 2014
Location: Antwerp
Device: Kobo Aura H2O
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Dewatermark is the one to use for that. (Btw, there's a dedicated subforum. )
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06-15-2022, 08:36 AM | #3 |
LivresInOz
Posts: 330
Karma: 15956
Join Date: May 2010
Device: Kobo: Forma + Libra|Galaxy: TAB A7 + Note 8 tablet|Boox: Note Air 2
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Oh wow...good guess by me!
Looked for a forum, and couldnt find it |
06-15-2022, 08:46 AM | #4 |
Diligent dilettante
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Join Date: Sep 2019
Location: in my mind
Device: Kobo Sage; Kobo Libra H2O
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06-17-2022, 10:04 AM | #5 |
LivresInOz
Posts: 330
Karma: 15956
Join Date: May 2010
Device: Kobo: Forma + Libra|Galaxy: TAB A7 + Note 8 tablet|Boox: Note Air 2
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Ok, just to confirm...it doesn't speed up rendering of the pdf...and appears to make the text disappear. Though I didn't stick around to fully test the latter, because the device was once again taking so long to do stuff, it felt like it was frozen.
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