crunchjpgs [options] infile.pdf [outfile.pdf]
Options:
-j --justjpgs make script skip non-JPGs
-q --quality select JPG output quality (default 50)
-s --scale=num select a rescaling factor for the JPGs (default 100%)
-m --scalemin=size don't scale JPGs smaller than this pixel size (width or height)
-O --only=imnum only change the specified images (can be used multiple times)
-S --skip=imnum don't change the specified images (can be used multiple times)
-o --order preserve the internal PDF ordering for output
--veryverbose increases the verbosity
-v --verbose print diagnostic messages
-h --help verbose help message
-V --version print CAM::PDF version
The available values for --scale are:
1 100%
2 50%
4 25%
8 12.5%
"imnum" is a comma-separated list of integers indicating the images in order that they appear in the PDF.
Use listimages to retrieve the image numbers.