Legacy ImageMagick Discussions Archive

Hi everyone. I am using imagemagick to batch trim a set of images to remove whitespace with the following command:
This works fine however how do I get the output image size to be squared? The images vary so there can't be a set squared size. I also saw this viewtopic.php?t=10419 which is quite similar to my request but I can't seem to figure out how to use those commands in addition to my command.

"-trim" will create a rectangular image. You want to make this square. How? You can crop it with "-crop". Or add transparent portions to make it square with "-background None -extent 200x200". In either case, it's easiest with two commands: "identify" to get the max or min dimension, then "convert" to crop or extent.

The third method, which you probably don't want, is to resize, changing the aspect ratio.

see http://www.imagemagick.org/Usage/thumbnails/#square

or if on Linux/MacOSX/Windows with Cygwin, see http://www.fmwconcepts.com/imagemagick/aspect/index.php