Adjusting copy contrast and density

Details Adjusting copy contrast and density Adjusting copy contrast and density

1980-04-25

1982-01-12

Moses, R. L.

Photocopying

Projection printing and copying cameras

Combined with or convertible to a contact printer

355 14CH, 355 77, G03G 1500

Patent

active

043102379

ABSTRACT:
In a copier having stored in memory, a matrix of sets, with each set having at least two different values corresponding to: (i) a specific voltage level Vo applied onto a photoconductor by the primary charger; and (ii) a specific copier exposure level Eo; for a "manufacturing standard" copier, that cause any copier which is identical to such standard copier to have a desired Din/Dout response curve, apparatus is provided which in response to variations from the manufacturing standard copier computes correction values and adjusts the values from the matrix of sets. The apparatus includes logic and control which responds to the adjusted set values to cause the copier to produce copies in accordance with the desired Din/Dout response curve.

REFERENCES:
patent: 3649114 (1972-03-01), Vlach et al.
patent: 3788739 (1974-01-01), Coriale
Photographic Science and Engineering, vol. 22, No. 3, May/Jun. 1978, pp. 159-164.

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