Legacy ImageMagick Discussions Archive

We are converting group 4 tiff images to pmg. This may deteriorate the quality. Just want to automate the validation of image quality check before and after conversion. Can some one please suggest, how to accomplish this task using image magick ? Basically want to know how to check image quality using image magick tool. Any help on this will be appreciated. Thanks in advance.

I presume you mean png and not pmg.

You can do a compare of two same sized images and get an error metric to tell the difference. This is not a check of quality as it does not know which image is better.

see
http://www.imagemagick.org/script/compare.php
http://www.imagemagick.org/Usage/compare/