Image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorsNobuatsu Sasanuma, Yuichi Ikeda
Life of this patent
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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.
Claims28
An image processing apparatus comprising:
- generating means for generating a test pattern signal;
- image forming means for forming a test image with recording materials on a medium in accordance with the test pattern signal;
- reading means for reading the test image formed on the medium by said image forming means, and generating image data, the medium being transported to the reading means by an operator;
- counting means for counting a time after an image forming of the test image with the recording materials;
- adjusting means for adjusting an image forming condition of said image forming means based on the image data generated by said reading means;
- and
- controlling means for controlling an adjusting operation in accordance with the time after the forming of the test image.
An image forming method comprising the steps of:
- generating a test pattern signal;
- forming a test image with recording materials on a medium, in accordance with the test pattern signal, by an image forming means;
- counting a time after an image forming of the test image with the recording materials;
- reading the test image formed on the medium by the image forming means with reading means and generating image data, the medium being transported to the reading means by an operator;
- adjusting an image forming condition of the image forming means based on the image data;
- and
- controlling an adjusting operation in accordance with the time after the forming of the test image.
An image processing apparatus comprising:
- first reading means for reading an original and generating image data;
- generating means for generating a test pattern signal corresponding to a test image;
- image forming means for forming an image on a medium in accordance with the image data or the test pattern signal;
- second reading means for reading the test image formed by said image forming means on the medium and generating test image data;
- and
- adjusting means for adjusting an image forming condition of said image forming means based on the test image data which is obtained by reading the test image formed in accordance with the test pattern signal,
- wherein a size of the test image is determined by taking an aberration of the medium in said second reading means into account.
An image processing method comprising the steps of:
- reading an original and generating image data;
- generating a test pattern signal corresponding to a test image;
- forming an image on a medium in accordance with the image data or the test pattern signal by an image forming means;
- reading the test image generated in said forming step on the medium and generating test image data by a reading means;
- and
- adjusting an image forming condition of the image forming means based on the test image data which is obtained by reading the test image formed in accordance with the test pattern signal,
- wherein a size of the test image generated in said forming step is determined by taking an aberration of the medium in the reading means into account.
Dependencies are inferred from the claim text.