Image processing apparatus which performs density control for ea

Details Image processing apparatus which performs density control for ea Image processing apparatus which performs density control for ea

1996-12-13

2000-04-25

Le, N.

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

G03G 1510

Patent

active

060550112

ABSTRACT:
When tone correction is performed by forming a tone patch and measuring density thereof, a contrast processing method used for Bk toner is applied to color toner patches (Y, M and C) to obtain relative density free from any influence of a background. More specifically, density of a predetermined standard gray chart is first measured by a density sensor, the measured value of the gray chart is then substituted into an equation expressing Bk toner density, and a constant of the density sensor is obtained by the least square method. By applying the obtained constant of the density sensor to an equation expressing color toner density, relative density of color toners to background density is obtained in a manner similar to that for the Bk toner.

REFERENCES:
patent: 5678132 (1997-10-01), Shiba et al.
patent: 5736996 (1998-04-01), Takada et al.

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