Image forming apparatus
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United States of America Patent
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Jan 12, 1999
Issued Date -
N/A
app pub date -
Oct 9, 1996
filing date -
Oct 29, 1993
priority date (Note) -
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status (Latency Note)
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Abstract
When a gradation test pattern is read a predetermined period of time after the gradation test pattern was fixed, the correction amount can be controlled based on a stable image density, and an image with good gradation characteristics can be formed. A gradation test pattern including all color patterns is output in accordance with a gradation test pattern registered in a test pattern memory area, and at the same time, a timer is started. After an elapse of a predetermined period of time stored in a RAM, the output gradation test pattern is read by an original reader. On the basis of the read image density, a .gamma.-LUT is set.
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