Photocopying – Projection printing and copying cameras – Multicolor picture
Patent
1990-03-08
1991-10-01
Hix, L. T.
Photocopying
Projection printing and copying cameras
Multicolor picture
355 68, 355 77, G03B 2780
Patent
active
050538071
ABSTRACT:
A color image producing method for producing a color image of a desired original is based on the use of a reference original having a certain light transmitting characteristic. A tone of the original corresponding to the intensity of light with respect to each of three primary colors is obtained by transmitting a predetermined light intensity through the original. The method includes the steps of detecting a difference in tone between the reference original and the desired original with respect to each of the three primary colors of light, and offsetting the tone difference by employing two primary colors, other than the red primary color of light. Since the tone difference is offset by employing the two primary colors, there occurs no degradation in color reproduction of the original as in a case where a cyan filter is inserted between a light source and the original to offset the tone difference, in dependence on the amount of the cyan filter inserted.
REFERENCES:
patent: 4101216 (1978-07-01), Grossmann
patent: 4565441 (1986-01-01), Evans et al.
patent: 4843431 (1989-06-01), Horiguchi et al.
Dainippon Screen Mfg. Co,. Ltd.
Hix L. T,.
Rutledge D.
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