Converting .icns files to .png file format
I have been trying to figure this one out for a while now, how to get an .icns file into a Photoshop readable format without having to purchase an icon editing suite. This simple command line tool does the job perfectly:
sips -s format png /Users/sam/Desktop/PrefApp.icns --out /Users/sam/Desktop/PrefApp.png
Almost too easy. I had made a copy of the System Preferences icon file to my desktop and using the above command was able to convert the file to a .png file and load it up in Photoshop, transparency intact and in all of its 512×512 pixel glory.