From me
Generate iOS app icons from simple source
If, for some reason, you don't use Apple's storyboard feature to generate the
zillions of icons needed for an app, I have here
the makezoom shell script
which will use one master file to spit out almost all the icons you need
this week to drag into Xcode to make an app happy.
The script uses mostly netpbm, with maybe some ImageMagick, to munge a
master image into the zillions needed in the image cassette. You still
have to drag each one in, making sure you aren't adding the wrong sizes (keep
an eye on the warning messages.) I tried to make the names useful.
An app still needs an image for the app store, which this doesn't do.
I do have another version of this script which uses LaTeX to generate
a nice text image that gets processed. I will put it up if requested.
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