Unable to do PDF comparison

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?".
Posts: 12161
Joined: 2010-01-23T23:01:33-07:00
Authentication code: 1151
Location: England, UK

Re: Unable to do PDF comparison

Post by snibgo » 2019-03-20T08:40:17-07:00

For the use of "null:", see http://www.imagemagick.org/script/comma ... php#layers , method "composite".

When you have a difference image that is black where there is no difference, you can process that image, eg "-auto-level", or "-fill white +opaque black" to turn all non-black into white.
snibgo's IM pages: im.snibgo.com

Post Reply