File Extension YEL File Format Yellow color separation YEL stands for Yellow color separation. This was last updated in March 2012 By Margaret Rouse Browse File Extensions Alphabetically: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z # Ask a Question. Find an Answer. Ask your peers a question about this file extension. Ask a Question How to terminate a cable and color arrangement prepress What does LCD shutter do when making yellow color?