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sips

"scriptable image processing system." - sip --help

Examples

Resize a DNG and save the output as JPG

SOURCE=foo.dng
sips --resampleHeightWidthMax 1024  --setProperty format jpeg "$SOURCE" --out "${SOURCE%.dng}.jpg"

Resize all images in the CWD that were taken by the D5100

mdfind -onlyin "$PWD" 'kMDItemAcquisitionModel == "NIKON D5100"' |
while read -r file ; do
  sips --resampleHeightWidthMax 1600 --setProperty format jpeg "${file}" --out "${file%.*}.jpg"
done

Resize all images in a dir tree, convert them to jpg and output them to a different folder

In the following example it is important to leave off the trailing slash on the target dir:

SRC_DIR="${HOME}/Pictures/photo_queue"
OUT_DIR="${HOME}/Desktop/Stuff/"
MAX_WIDTH=1600
find "${SRC_DIR}" \
  -type f \
  -exec sips \
        --resampleHeightWidthMax "${MAX_WIDTH}" \
        --setProperty format jpeg {} \
        --out "${OUT_DIR}" \;

See Also