iOS: how to reduce size of large PNG files

Question

I\'m currently optimizing my iOS app for the new iPad. Unfortunately by adding launch images for the iPad retina display the size of my ipa grows from 1.2MB to

Answer 1

I'm using a great tool called ImageOptim

It incorporates a number of tools inside which crush your png files significantly (in my case it was between 25% to 50%).

One thing to remember is to disable Xcode's PNG optimization (as explained on the website)

EDIT: Simply drag the images to the imageOptim window and the optimization will start automatically