Legacy ImageMagick Discussions Archive

I have a 32 bit single channel EXR image that I want to crop using ImageMagick, the problem is after I crop it it got saved into 32 bit 3 channel image by ImageMagick.

Below are the attempts that I tried that didn't work
This returns error mogrify: unrecognized image colorspace `Y'.
This returns 32 bit 3 channel image.
This returns 8 bit 1 channel image.

I am on Ubuntu 16.04 and my version of ImageMagick is 6.9.6-4 Q32 x86_64.

How can I make ImageMagick to save my EXR file with the original single channel 32 bit format?

Don't use mogrify. It is old and limited. Use convert. It may or not work, depending upon the library for EXR images

convert test.exr -crop 200x100+238+200 +repage result.exr

@fmw I ran your command and it still saves it as 3 channel image.

Post your single channel (grayscale) EXR file to some place such as dropbox.com and put the URL here, so we can test with it.

Did you try:
See http://www.imagemagick.org/script/formats.php

EXR images often extend outside the normal range of values. Have you tried HDRI? See http://www.imagemagick.org/script/high- ... -range.php

I am not positive, but I thought IM only supported the EXR "half" format (16-bit).

@fmw42 I just tried your new command and it works! I think -define exr:color-type=Y does it. Thanks a lot for your help