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rkomar · 08-27-2018, 06:09 PM

I had good results in the past using PDFBeads to create PDF files from scanned images. It converts black and white images to jbig2 format within the PDF, and I hadn't noticed any problems with those on my Inkpad 1 (except for being slow to load). However, PDFBeads looks to be unmaintained now, so I'm not sure if it still builds on modern systems. I guess you can always just try it and see.

JBIG2 is the most efficient format for black and white images, but the CCIT Group 4 format is pretty good, as well, and decodes much more quickly on the PocketBook devices than JBIG2. Perhaps if you could store the images in that format in the PDF files, it would work better on the ereader. The PDF files would be larger, but I think that's a small price to pay for speed and reliability.

08-27-2018, 06:09 PM	#2
rkomar Wizard Posts: 3,055 Karma: 18821071 Join Date: Oct 2010 Location: Sudbury, ON, Canada Device: PRS-505, PB 902, PRS-T1, PB 623, PB 840, PB 633	I had good results in the past using PDFBeads to create PDF files from scanned images. It converts black and white images to jbig2 format within the PDF, and I hadn't noticed any problems with those on my Inkpad 1 (except for being slow to load). However, PDFBeads looks to be unmaintained now, so I'm not sure if it still builds on modern systems. I guess you can always just try it and see. JBIG2 is the most efficient format for black and white images, but the CCIT Group 4 format is pretty good, as well, and decodes much more quickly on the PocketBook devices than JBIG2. Perhaps if you could store the images in that format in the PDF files, it would work better on the ereader. The PDF files would be larger, but I think that's a small price to pay for speed and reliability.