How to manually create icns files using iconutil?

Question

When I\'m validating my app I get this error:

the application bundle does not contain an icon in ICNS format, containing both a 512x512

Answer 1

These commands (entered in Terminal) worked for me to convert an old icns file to the new format:

cd Folder_With_Icns_File
iconutil -c iconset Your_Icon_Name.icns 
rm Your_Icon_Name.icns 
iconutil -c icns Your_Icon_Name.iconset
rm -R Your_Icon_Name.iconset

Update

The -c parameter to iconutil is no longer supported. Use --convert instead:

cd Folder_With_Icns_File
iconutil --convert iconset Your_Icon_Name.icns 
rm Your_Icon_Name.icns 
iconutil --convert icns Your_Icon_Name.iconset
rm -R Your_Icon_Name.iconset