k2pdfopt: optimizes PDFs for viewing on e-readers

[greening]

Hi! I've been able to convert a lot of scanned pdfs from unreadable to readable with the tool, for which many thanks. I have now however run into a problem: on one of my pdfs, the background is quite dark, although not dark enough to be unreadable on kobo. However, when I try to convert it, the background becomes even darker and so practically unreadable. Is there any way to fix this? None of the settings I've found googling around have really helped. Thank you!

[willus]

It would help the most if you could post an example page or two of the source PDF so I could try converting it myself. Or send it to me in a private message. I'd probably first try adjusting either the -cmax or the -wt command-line settings.

[greening]

Thank you for the answer! Here are two sample pages.

[jonnyl]

@greening: the attached is what I get using the options

-g 1.5 -wt+ 35

[greening]

@jonnyl Thank you so much! That worked perfectly!

[isaacbh]

It looks like the Kindle adds its own margins on top of what I set using k2pdfopt. I've already set -om to 0 which helps but I still get about 1cm of margins at the sides when viewed on my Kindle Paperwhite 12 (with smallest margins setting). Is there a way to further reduce margins using k2pdfopt?

[willus]

Originally Posted by isaacbh

It looks like the Kindle adds its own margins on top of what I set using k2pdfopt. I've already set -om to 0 which helps but I still get about 1cm of margins at the sides when viewed on my Kindle Paperwhite 12 (with smallest margins setting). Is there a way to further reduce margins using k2pdfopt?

Look at the PDF that k2pdfopt creates in a PDF reader on a PC. Does it have any margins around the text? If not, that's all that can be done. Otherwise, it may depend on your source PDF and the other settings you are using with k2pdfopt. If you want, you can post a couple of example pages from your source file--that would help.