G - Physics – 03 – B
Patent
G - Physics
03
B
95/6
G03B 27/32 (2006.01) G03B 27/72 (2006.01)
Patent
CA 1258195
Abstract of the Disclosure A process is disclosed for preparing a pre-press proof of an original subject having high- light, midtone and shadow tone areas using a color print paper wherein the dyes of the print paper are brought into substantial color compliance with the yellow, cyan and magenta process inks to be used in producing a lithographic reproduction of the origi- nal subject. The tonal range of the proof image is also extended to closely match that of the final printed product. After determining the densitometer readings for yellow, magenta and cyan through blue, green and red filters respectively for the print paper and the process inks, the print paper is exposed to light through each filter with an appro- priate color separation halftone negative over the film and with combinations of filters being used for hue correction of the yellow, magenta and cyan film dye coupling dyes. A masked short scale yellow separation halftone negative is used to prepare a dye transfer matrix thereof, the image defining portions of the matrix are dyed with a yellow trans- fer dye arid the yellow is then transferred to the print paper sheet since the yellow coupling dye of the print paper has an excess of magenta and will not provide a true lemon-yellow color in the proof. Exposure of the print paper through color separation positives along with the same separation negatives through corresponding filters provides tone balance and allows compensation for dot gain in printing.
493855
Gowling Lafleur Henderson Llp
Morgan James T. Jr.
LandOfFree
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