How can I easily bulk generate icons on macOS?
Source: Originally mentioned by strogonoff on Hacker News
You can use sips together with iconutil to generate a complete .icns file for your app from a single 1024 by 1024 PNG without any third party software:
mkdir MyIcon.iconset
cp Icon1024.png MyIcon.iconset/icon_512x512@2x.png
sips -z 16 16 Icon1024.png --out MyIcon.iconset/icon_16x16.png
sips -z 32 32 Icon1024.png --out MyIcon.iconset/icon_16x16@2x.png
sips -z 32 32 Icon1024.png --out MyIcon.iconset/icon_32x32.png
sips -z 64 64 Icon1024.png --out MyIcon.iconset/icon_32x32@2x.png
sips -z 128 128 Icon1024.png --out MyIcon.iconset/icon_128x128.png
sips -z 256 256 Icon1024.png --out MyIcon.iconset/icon_128x128@2x.png
sips -z 256 256 Icon1024.png --out MyIcon.iconset/icon_256x256.png
sips -z 512 512 Icon1024.png --out MyIcon.iconset/icon_256x256@2x.png
sips -z 512 512 Icon1024.png --out MyIcon.iconset/icon_512x512.png
iconutil -c icns MyIcon.iconset
As a bonus, generate .ico with ffmpeg:
ffmpeg -i MyIcon.iconset/icon_256x256.png icon.ico
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