NAME
sips -- scriptable image processing system.
SYNOPSIS
sips [image-query-functions] imagefile ...
sips [profile-query-functions] profile ...
sips [image-modification-functions] imagefile ... [--out result-file-or-dir]
sips [profile-modification-functions] profile ... [--out result-file-or-dir]
DESCRIPTION
This tool is used to query or modify raster image files and ColorSync ICC profiles. Its functionality
can also be used through the "Image Events" AppleScript suite.
...
Among the parameters, -z (-Z) can be used to resize images.
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-z pixelsH pixelsW
--resampleHeightWidth pixelsH pixelsW
Resample image at specified size. Image apsect ratio may be altered.
--resampleWidth pixelsW
Resample image to specified width.
--resampleHeight pixelsH
Resample image to specified height.
-Z pixelsWH
--resampleHeightWidthMax pixelsWH
Resample image so height and width aren't greater than specified size.