Image-forming apparatus and method for evaluating gradation...

Details Image-forming apparatus and method for evaluating gradation... Image-forming apparatus and method for evaluating gradation...

2006-03-21

2006-03-21

Grant, II, Jerome (Department: 2626)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S003010, C358S003100, C358S534000

Reexamination Certificate

active

07016078

ABSTRACT:
An image-forming apparatus processes image signals based on a predetermined gradation-converting curve. The predetermined gradation-converting curve includes at least one of: a first gradation in which a maximum absolute-value of a difference between a lightness gradation curve and its smoothed curve in a range of about 1/10 of its gradation number is not greater than 1; a second gradation in which a maximum absolute-value of first-order differential values of a difference curve between a lightness gradation curve and its smoothed curve in a range of about 1/10 of its gradation number is not greater than 100; and a third gradation, in which a maximum absolute-value of first-order differential values of a difference curve between a first smoothed curve in a range of about 1/100 of a gradation number and a second smoothed curve in a range of about 1/10 of a gradation number, is not greater than 100.

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