Icon generator script for custom icon sizes

gen_icon.sh

#!/bin/sh

# 
#  Usage : 
#  ./gen_icon.sh images/icon-512.png "icon-" "10 25"
#  Output: 
#   out_icons/icon-10.png
#   out_icons/icon-25.png

source_image="$1"
out_name_prefix=${2:-"icon_"}


arr_defautl=( 16 32 64 128 256 512)
out_sizes=${3:-${arr_defautl[@]} }

outdir="out_icons"

rm -rf "${outdir}"
mkdir "${outdir}" 2>/dev/null


for size in ${out_sizes[@]}; do
    sips -z "${size}" "${size}"  "${source_image}" --out "${outdir}/${out_name_prefix}${size}.png" >/dev/null
done

ls -la "${outdir}"

# Example for iconset
# sips -z 16 16     Icon1024.png --out MyIcon.iconset/icon_16x16.png
# sips -z 32 32     Icon1024.png --out MyIcon.iconset/[email protected]
# sips -z 32 32     Icon1024.png --out MyIcon.iconset/icon_32x32.png
# sips -z 64 64     Icon1024.png --out MyIcon.iconset/[email protected]
# sips -z 128 128   Icon1024.png --out MyIcon.iconset/icon_128x128.png
# sips -z 256 256   Icon1024.png --out MyIcon.iconset/[email protected]
# sips -z 256 256   Icon1024.png --out MyIcon.iconset/icon_256x256.png
# sips -z 512 512   Icon1024.png --out MyIcon.iconset/[email protected]
# sips -z 512 512   Icon1024.png --out MyIcon.iconset/icon_512x512.png
# cp Icon1024.png MyIcon.iconset/[email protected]
# iconutil -c icns MyIcon.iconset
# rm -R MyIcon.iconset