How to use both convert and compare in one command?

[mattalexx]

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.

[fmw42]

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:

[mattalexx]

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

Awesome, thanks!

[anthony]

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