pdf contrast

Questions and postings pertaining to the usage of ImageMagick regardless of the interface. This includes the command-line utilities, as well as the C and C++ APIs. Usage questions are like "How do I use ImageMagick to create drop shadows?".
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Dinis
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Joined: 2015-01-27T15:06:55-07:00
Authentication code: 6789

pdf contrast

Post by Dinis »

Hello,
I want to print in black and white a pdf with text on a colored background and I want it to read well on paper. I've tried -contrast and several +contrast and it even reads worse. What should I do?
It has a lot of pages and I'm going to print it in a shop.
Thanks.
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fmw42
Posts: 25562
Joined: 2007-07-02T17:14:51-07:00
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Location: Sunnyvale, California, USA

Re: pdf contrast

Post by fmw42 »

Please always provide your version of IM and platform? If you have a current enough version of IM, try -brightness-contrast or -sigmoida-contrast.
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