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I always have zillions of images to scale down. I generally use Photoshop for this, but even using actions Photoshop sucks for working with batches of images.

Can you guys recommend a good app I can use on Mac OS X to scale images (specially PNGs and JPEGs) with good quality?

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up vote 3 down vote accepted

Are you editing them individually, or are you looking for a graphics app that can handle batching commands? For the latter (and sometimes also for the former), I like GraphicConverter. Here's their page on Batch conversion with additional functions.

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thanksssssssssss! – SpaceDog Aug 26 '10 at 23:15

Why not just use automator?

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Always worked like a charm for me. I rarely had more than a hundred images, however I think it scales well. Automator's great for non-branching tasks. – Daniel Beck Aug 26 '10 at 21:58
Macworld just posted a tutorial about it to boot:… – Chealion Aug 27 '10 at 3:51

ImageMagick does batch processing and runs from the command line.

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