(1) (
Group
Code
Recording) An earlier encoding method used on magnetic tapes and Apple II and Mac 400K and 800K floppy disks.
(2) (
Gray
Component
Replacement) A method for reducing the amount of printing ink used. It substitutes black for the amount of gray contained in a color, thus black ink is used instead of the three CMY inks. See
UCR and
dot gain.