A Color Key
is an overlay proof
created from the film separations
that places each ink color on a separate clear acetate sheet then assembles them together over white paper. Although not as accurate as other color proofing methods
, the Color Key proof is designed to approximate four color printing
Color Key is actually a brandname for a specific process that is often used generically to apply to any overlay proofing system.
Also Known As: overlay proof | separations proof | film proof
Alternate Spellings: Color-key
Use Color Key overlay proofs to check registration, trapping, and color breaks, identify density problems and pixelation of bitmaps. Can be used for process and spot color jobs. Overlay proofs are less reliable than laminate proofs.