Legacy ImageMagick Discussions Archive

Use https://github.com/ImageMagick/ImageMagick/discussions instead.
https://imagemagick.com/discourse-server/

Increase low-contrast pdf readability

https://imagemagick.com/discourse-server/viewtopic.php?t=22682

Page 1 of 1

Increase low-contrast pdf readability

Posted: 2013-01-27T12:42:50-07:00
by despeckle
How should I go about making a scanned pdf with light-grey background and darker grey letters more easily readable?
A page fragment for your reference: http://i.imgur.com/J5akirF.png
Already tried -contrast option and Fred's autolevel script, to no avail.

Re: Increase low-contrast pdf readability

Posted: 2013-01-27T12:47:19-07:00
by fmw42
try my textcleaner script, and/or IM -brightness-contrast to adjust the contrast

Re: Increase low-contrast pdf readability

Posted: 2013-01-27T20:34:03-07:00
by snibgo
A simple contrast-stretch works fine:

Code: Select all

convert J5akirF.png -set colorspace RGB -contrast-stretch 4x80% j.png
All times are UTC-07:00
Page 1 of 1

Powered by phpBB® Forum Software © phpBB Limited