Retinize It

Photoshop actions for preparing designs for iOS or optimize

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Here's a nice collection of Photoshop tools, curated by @andrianv.
This just saved me a ton of time. I made one adjustment though. This one scales up for 2x, 3x. I changed the actions to start with 3x and scale down 66.67% for 2x and then 50% for 1x