Photocopying – Projection printing and copying cameras – Multicolor picture
Patent
1982-06-07
1984-08-07
Hayes, Monroe H.
Photocopying
Projection printing and copying cameras
Multicolor picture
G03B 2780
Patent
active
044640455
ABSTRACT:
A color copying apparatus having a photoelectric color exposure control device is calibrated by making a copy of a calibrating original, which includes a gray stepped wedge, on a photographic copying material using an exposure determined by the photoelectric color exposure control device and assumed to be proper for achieving the desired density values in the developed image of the calibrating original. The density of the developed image of the gray stepped wedge is then measured in order to obtain actual density values, which are compared with corresponding desired density values. Finally, the photoelectric color exposure control device is adjusted for achieving the required exposure correction as determined during the comparison of the actual and desired values. The calibration is performed for each of the individual values so that correction of the control device is also achieved for each of the corresponding colors.
REFERENCES:
patent: 2969709 (1961-01-01), Zeyen et al.
patent: 3120782 (1964-02-01), Goddard et al.
patent: 4174173 (1979-11-01), Pone
patent: 4222661 (1980-09-01), Wahli et al.
patent: 4274732 (1981-06-01), Thurm et al.
Fergg Berthold
Findeis Gunter
Kuhn Gerhard
Zahn Wolfgang
Agfa-Gevaert Aktiengesellschaft
Hayes Monroe H.
Kontler Peter K.
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