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by xcntktn 4483 days ago
> I used [Homebrew] to install ImageMagick (the only OS X tool I know of where you can resize pictures on the command line)…

There's the built-in command "sips" that comes on every Mac and has been around since at least OS X Lion (10.7). The name stands for "scriptable image processing tool", and the tool appears to use CoreGraphics to do its work.

More info here:

https://developer.apple.com/library/mac/documentation/Darwin...