Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1977-09-19
1979-03-20
Murray, Richard
Facsimile and static presentation processing
Static presentation processing
Attribute control
H04N 584
Patent
active
041457099
ABSTRACT:
A method and apparatus for adjusting an exposure of a negative image having incremental areas to enhance the contrast of a print resulting from the negative image. The incremental areas of the negative image to be printed are initially scanned providing corresponding sensor signals which are directed to a processing circuit which separates the sensor signals into amplitude ranges according to the amplitude of the sensor signal and according to the amplitude range of the sensor signal as compared to an average sensor signal. Each range is inputted to a signal generator which provides a corresponding signal having an adjusted wavelength determining contrast and an adjusted amplitude determining intensity of exposure, each dependant upon the corresponding amplitude range and amplitude of the sensor signals, respectively. If the sensor signals are at an amplitude which is less than the average sensor signal, the corresponding signal has a proportionally increased intensity. If the sensor signals are at an amplitude which is greater than the average sensor signal the corresponding signal has a proportionally decreased intensity. The corresponding signals are directed to a color gun of a CRT which is used to provide the light necessary to illuminate the corresponding incremental area of the negative image for printing on a raw photographic stock. The wavelength of the corresponding signal generator is pre-set dependant upon the amplitude range to result in a CRT output which provides color light corresponding to a desired level of contrast created by the photographic raw stock.
REFERENCES:
patent: 3697174 (1972-10-01), McCune
patent: 3934081 (1976-01-01), Schumacher
patent: 4058828 (1977-11-01), Ladd
Bellamy Werten F. W.
Gapcynski William G.
Murray Richard
Winters Sherman D.
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