I couldn't find any free tool, that correctly automatically remove spots from my books.
Example page of my real book:
I want to delete these spots:
How I can automatically do it? Irrelevant, for images or PDF.
I have bad-quality third-party scanned books in DjVu or PDF formats. Example page:
I processed books in ScanTailor Advanced → I set to the maximum
But in the output I however got spots for many books pages.
4. Do not offer
- Non-free tools
- Yes, I can manually remove these spots use tools as GIMP
Bucket Fill. But the manual spots removing takes a lot of time for big books.
5. Not helped
5.1. Scan handlers
5.2. Image editors5.2.1. Not supported
ImageJ cannot open TIFF files compressed in this fashion (4)
5.2.1. No effect
magick KiraDespeckle.tif -despeckle KiraMagick.tif
gm convert KiraDespeckle.tif -despeckle KiraGraphicsMagick.tif
5.3. PDF editors
I couldn't find, how I can get expected behavior, use these tools (free versions):
- PDF-XChange Editor
- LibreOffice Draw
- Icecream PDF Editor