mogrify

Perform operations on multiple images, such as resizing, cropping, flipping, and adding effects. Changes are applied directly to the original file. More information: https://imagemagick.org/script/mogrify.php.

• Resize all JPEG images in the directory to 50% of their initial size:

mogrify -resize {{50%}} {{*.jpg}}

• Resize all images starting with "DSC" to 800x600:

mogrify -resize {{800x600}} {{DSC*}}

• Convert all PNG images in the directory to JPEG:

mogrify -format {{jpg}} {{*.png}}

• Halve the saturation of all image files in the current directory:

mogrify -modulate {{100,50}} {{*}}

• Double the brightness of all image files in the current directory:

mogrify -modulate {{200}} {{*}}