image

imagemagick, imagemagick-6-doc:

convert: convert image format and other transforms
- convert img.jpg img.png (Convert jpg into png)
- convert xx*.png -append example.png (Convert a bunch of png files into one)
- convert -background white -fill black -gravity center -size 55x pango:"<b>1980s\nto\n1990s</b>" o.jpg (Create a small icon JPEG with bold text)
mogrify: similar to convert but modifies the same image in place
- mogrify -resize 480x pic.jpg (resize image to 480 px wide)
- mogrify -auto-orient pic.jpg (rotate image to match exif tag)

exiftool: manage exif image metadata
- exiftool -all= -overwrite_original pic.jpg (remove all exif tags without backup)
- exiftool -list pic.jpg (list all exif tags)

Combinations:

Resize images with width greater than 600 px to 600 px:
- find . -type f -exec sh -c 'identify -format "%[fx:(w>600)]\n" "$0" | grep -q 1' {} \; -print0 | xargs -0 mogrify -resize 600x

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