Since the last year I’ve been doing more and more iOS development and found last week that this thing with icons and sizes can be a tiersome timesink so I wrapped up two small scripts to shave off some time. The first one is one to generate AppStore icons from the original 1024x1024 image and all the sizes I need for a universial app.
Just copy and pastet the script above into a file, make it executable and run it. I think you could optimize it by giving ImageMagick more parameters for scaling quality but so far I haven’t seen any visual degrading so far, but use it at your own risk.
The second script is just a simple one to create two images in 1x and 2x sizes. I’ve use this for some icons that I get in the 3x size and need to scale down to 1x and 2x sizes. This script scales down the original image into a 67% size and 33% size for the images and sizes I have tested this creates the best 1x and 2x sizes.
This has already save me some time and hopefully someone else might have some use of these scripts as well.