Method of density correction and an image recording apparatus

Details Method of density correction and an image recording apparatus Method of density correction and an image recording apparatus

1997-03-11

2000-06-06

Le, N.

Incremental printing of symbolic information

Thermal marking apparatus or processes

Density control

347183, B41J 205

Patent

active

060725133

ABSTRACT:
In image recording, density correction is performed by an improved method in which the image densities on a density correcting reference chart that have known densities which are associated with a visual density are measured with a densitometer for setting the density correcting conditions, the correcting conditions for correcting the values of measurement with the densitometer such that they coincide with the image densities on the reference chart are constructed from the image densities on the reference chart and the values of measurement with the densitometer, and the density correcting conditions are set in accordance with the constructed density correcting conditions. Alternatively, the density correcting conditions are set in consideration of a threshold for color formation to occur in the thermal recording material or the maximum heating time in thermal recording is controlled. In accordance with these methods and using an apparatus in which they are implemented, appropriate density correcting conditions can be set irrespective of the individual differences between densitometers used in the setting operation and satisfactory tones can be reproduced even in highlight density areas, thereby achieving consistent formation of high-quality images which feature effective reproduction of the desired gradation.

REFERENCES:
patent: 4827279 (1989-05-01), Lubinsky et al.
patent: 5422664 (1995-06-01), Stephany
patent: 5508826 (1996-04-01), Lloyd et al.
patent: 5710871 (1998-01-01), Tadenuma et al.

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