Legacy ImageMagick Discussions Archive

I would like to use convert to resize an image to the size of another image before I use compare to compare them. I want to do this in one command so I can avoid saving a temp file from convert to use in compare.

I wish I wasn't so bad with standard output and stuff like that. Is there anyway to accomplish what I'm after?

Thanks.

This does not work as compare does not seem to allow parenthesis processing and objects to -resize

compare -metric rmse image1.jpg \( image2.jpg -resize WIDTHxHEIGHT \) null:


But you can do this by piping the output from convert (as temporary miff file that automatically goes away) to compare.

convert image2.jpg -resize WIDTHxHEIGHT miff:- | compare -metric rmse - image1.jpg null:

fmw42 wrote: convert image2.jpg -resize WIDTHxHEIGHT miff:- | compare -metric rmse - image1.jpg null:

Awesome, thanks!

Only convert and montage allows the use of parenthesis. and only compare allows the use of -metric.

You can get some compare handling in "convert" by using a "Difference" composition of the two images, but that is about as far as it goes.
http://www.imagemagick.org/Usage/compare/#difference