Quote:
Originally Posted by slex
Variant 1
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pdf2djvu filename.pdf -o filename.djvu
This is quick and dirty, but it doesn't produce the best results (more suitable for conversion of text-based pdfs). The output djvu file is comparable in size with the original pdf.
Variant 2
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You can get better results if you put the pdf file in a separate directory. Then
pdfimages filename.pdf f
This will produce image files named f-001.pbm (if the pdf is black and white) ... or f-001.ppm (if it has color).
You have several options from then on.
Variant 2B
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Get the program gscan2pdf from the repositories.
You can add pbm files directly into gscan2pdf. Then export as djvu. The file will be smaller than the original pdf - probably 2-3 times - but you are unlikely to achieve the compression in Variant 2A.
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Thanks Slex for yours explanations, it's woks fine !
On my Linux, I must compile and test later ScanTailor.