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rkomar · 08-26-2011, 01:10 PM

I made my own PDFs based on scans of my old technical books, and I used Group4 CCITT compression on the B/W scans. My PDFs are readable under both AdobeViewer and pdfviewer without problems. The difference may be that I converted the scans to the TIFF format before incorporating them in the PDFs. I'm guessing that the viewers then use libtiff to decode the images, which handles the CCITT decompression. If you are creating the PDF files yourself from scans, you could try doing the same thing.

08-26-2011, 01:10 PM	#7
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 made my own PDFs based on scans of my old technical books, and I used Group4 CCITT compression on the B/W scans. My PDFs are readable under both AdobeViewer and pdfviewer without problems. The difference may be that I converted the scans to the TIFF format before incorporating them in the PDFs. I'm guessing that the viewers then use libtiff to decode the images, which handles the CCITT decompression. If you are creating the PDF files yourself from scans, you could try doing the same thing.