AppStore Icons Generator

asicon.sh

#!/bin/bash
# According to https://developer.apple.com/library/ios/#qa/qa1686/_index.html
# Install ImageMagick with MacPort: sudo port install ImageMagick
convert $1 -resize 512x512  iTunesArtwork.png  # Ad Hoc iTunes
convert $1 -resize 144x144  Icon-72@2x.png     # Home screen for "The New iPad"
convert $1 -resize 114x114  Icon@2x.png        # Home screen for Retina display iPhone/iPod
convert $1 -resize 72x72    Icon-72.png        # App Store and Home screen on iPad
convert $1 -resize 58x58    Icon-Small@2x.png  # Spotlight and Settings for Retina display
convert $1 -resize 57x57    Icon.png           # Home screen on non-Retina iPhone/iPod
convert $1 -resize 50x50    Icon-Small-50.png  # Spotlight on iPad 1/2
convert $1 -resize 29x29    Icon-Small.png     # Settings on iPad and iPhone, and Spotlight on iPhone

2015 Jun update:

#!/bin/bash
# According to https://developer.apple.com/library/ios/#qa/qa1686/_index.html
# Install ImageMagick with MacPort: sudo port install ImageMagick
# run on mac: sh asicon.sh src.png
convert $1 -resize 1024x1024 iTunesArtwork@2x.png   # App list in iTunes for devices with retina display
convert $1 -resize 512x512  iTunesArtwork.png       # Ad Hoc iTunes
convert $1 -resize 180x180  Icon-60@3x.png          # Home screen on iPhone 6 Plus
convert $1 -resize 144x144  Icon-72@2x.png          # Home screen for "The New iPad"
convert $1 -resize 152x152  Icon-76@2x.png          # Home screen on iPad with retina display
convert $1 -resize 120x120  Icon-Small-40@3x.png    # Spotlight on iPhone 6 Plus
convert $1 -resize 120x120  Icon-60@2x.png          # Home screen on iPhone/iPod Touch with retina display
convert $1 -resize 114x114  Icon@2x.png             # Home screen for Retina display iPhone/iPod
convert $1 -resize 87x87    Icon-Small@2x.png       # Settings on iPhone 6 Plus
convert $1 -resize 80x80    Icon-Small-40@2x.png    # Spotlight on devices with retina display
convert $1 -resize 76x76    Icon-76.png             # Home screen on iPad
convert $1 -resize 72x72    Icon-72.png             # App Store and Home screen on iPad
convert $1 -resize 58x58    Icon-Small@2x.png       # Spotlight and Settings for Retina display
convert $1 -resize 57x57    Icon.png                # Home screen on non-Retina iPhone/iPod
convert $1 -resize 50x50    Icon-Small-50.png       # Spotlight on iPad 1/2
convert $1 -resize 40x40    Icon-Small-40.png       # Spotlight
convert $1 -resize 29x29    Icon-Small.png          # Settings on iPad and iPhone, and Spotlight on iPhone