Posted: 2006-05-15T07:24:39-07:00
ImageMagick does not expand subdirectories. You will need to write a shell script or a PerlMagick script to handle subdirectories with ImageMagick.
Use https://github.com/ImageMagick/ImageMagick/discussions instead.
https://imagemagick.com/discourse-server/
https://imagemagick.com/discourse-server/viewtopic.php?t=6570