MobileRead Forums - View Single Post - k2pdfopt: optimizes PDFs for viewing on e-readers

Shohreh · 02-07-2022, 05:58 PM

Hello,

I'd like to recompress an 800-page black and white PDF that is actually a scanned + OCRed copy of an out-of-print book.

This is for viewing on the computer, not on an e-reader specifically.

Without knowing what I'm doing, I simply tried the "-bpc" option on a single page, but it looks nowhere like the original, and it's the same size (~130kB → The whole book would be about 100MB, like the original).

What switches would you suggest I try?

Thank you.

--

Edit: The following using Ghostscript only shrinks the page slightly (101,684 bytes → 85,876) :

Code:

"c:\Program Files\gs\gs9.55.0\bin\gswin32c.exe" -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/screen -dNOPAUSE -dQUIET -dBATCH -sOutputFile=single.output.pdf single.pdf

02-07-2022, 05:58 PM	#1907
Shohreh Addict Posts: 207 Karma: 304158 Join Date: Jan 2016 Location: France Device: none	Compressing a scanned PDF? Hello, I'd like to recompress an 800-page black and white PDF that is actually a scanned + OCRed copy of an out-of-print book. This is for viewing on the computer, not on an e-reader specifically. Without knowing what I'm doing, I simply tried the "-bpc" option on a single page, but it looks nowhere like the original, and it's the same size (~130kB → The whole book would be about 100MB, like the original). What switches would you suggest I try? Thank you. -- Edit: The following using Ghostscript only shrinks the page slightly (101,684 bytes → 85,876) : Code: "c:\Program Files\gs\gs9.55.0\bin\gswin32c.exe" -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/screen -dNOPAUSE -dQUIET -dBATCH -sOutputFile=single.output.pdf single.pdf Last edited by Shohreh; 02-08-2022 at 08:26 AM.