input_filepath="images/logo1024.png"
output_iconset_name="images/APP.iconset"
mkdir $output_iconset_name
sips -z 16 16 $input_filepath --out "${output_iconset_name}/icon_16x16.png"
sips -z 32 32 $input_filepath --out "${output_iconset_name}/[email protected]"
sips -z 32 32 $input_filepath --out "${output_iconset_name}/icon_32x32.png"
sips -z 64 64 $input_filepath --out "${output_iconset_name}/[email protected]"
sips -z 128 128 $input_filepath --out "${output_iconset_name}/icon_128x128.png"
sips -z 256 256 $input_filepath --out "${output_iconset_name}/[email protected]"
sips -z 256 256 $input_filepath --out "${output_iconset_name}/icon_256x256.png"
sips -z 512 512 $input_filepath --out "${output_iconset_name}/[email protected]"
sips -z 512 512 $input_filepath --out "${output_iconset_name}/icon_512x512.png"
iconutil -c icns $output_iconset_name