Stuff
-resize 100x40
-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
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
- http://www.noah.org/wiki/ImageMagick