Legacy ImageMagick Discussions Archive

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.

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