A quick reference for common Imagemagick commands and switches.

Common options

Option Description
-resize 100x40 Resize to a dimension
-crop 40x30+10+10 (width)x(height)+(x)+y
-crop 40x30-10-10 (width)x(height)+(x)+y
-flip Vertical
-flop Horizontal
-transpose Flip vertical + rotate 90deg
-transverse Flip horizontal + rotate 270deg
-trim Trim image edges
-rotate 90 Rotate 90 degrees

Resize to fit

convert input.jpg -resize 80x80^ -gravity center -extent 80x80 icon.png

Convert all images to another format

mogrify -format jpg -quality 85 *.png

Make a pdf

convert *.jpg hello.pdf

References