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Generate WatchKit app icons from a 1024px icon
for size in 24 27.5 29 40 44 86 98; do pixel_size=`echo $size \* 2 | bc`; convert -resize $pixel_size 1024-square.png icon-$size@2x.png; done
convert -resize $(expr 29 \* 3) 1024-square.png icon-29@3x.png
for i in icon-*.png ; do convert "$i" -background black -alpha remove -alpha off "${i}" ; done
/Applications/ImageOptim.app/Contents/MacOS/ImageOptim icon-*.png
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