In that case, the actual photograph must be supplied with the rest of the ad material. Skydiving can use 35 mm slides or 35 mm color negatives if prints are unavailable or inconvenient. The print should be sharp and clear, and it should be about the same size as it will appear in the ad. It need not be cropped correctly. It should be free of marks and tape.
Proofs Provide a positive proof with all ads.
But for color ads, supply a Color Key or, if that's unavailable, a Matchprint, Chromalin or similar industry-standard proof. Without a proof Skydiving's printer has no way of knowing how the printed ad should look. The appearance of the final ad may be quite different than the original. Colors Skydiving is printed by the standard four-color process. The four colors are cyan, magenta, yellow and black.