Image forming apparatus
First Claim
1. An image forming method in an image forming apparatus which forms a color image by adhering plural coloring materials to a recording medium, said method comprising:
- an input step of inputting an image signal;
a color conversion step of performing a color conversion process to the input image signal, on the basis of profile data;
a gradation conversion step of performing a gradation conversion process to the image signal subjected to the color conversion process in said color conversion step;
a correction step of correcting an output characteristic inherent in the image forming apparatus; and
a limitation step of limiting the sum total of signal levels of the image signals of respective color components, in regard to the image signals subjected to the gradation conversion process in said gradation conversion step.
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Abstract
In an image forming apparatus which forms a color image by superposing cyan, magenta, yellow and black toners on a recording medium, a circuit to limit image signals is provided immediately before a gamma correction circuit which corrects an output characteristic inherent in the apparatus so that the sum total of the signal levels of the image signals of the respective colors does not exceeds a predetermined value. Thus, even if a user arbitrarily sets color profile data for color management, a toner spread amount can be controlled not to exceed the predetermined value.
27 Citations
8 Claims
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1. An image forming method in an image forming apparatus which forms a color image by adhering plural coloring materials to a recording medium, said method comprising:
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an input step of inputting an image signal;
a color conversion step of performing a color conversion process to the input image signal, on the basis of profile data;
a gradation conversion step of performing a gradation conversion process to the image signal subjected to the color conversion process in said color conversion step;
a correction step of correcting an output characteristic inherent in the image forming apparatus; and
a limitation step of limiting the sum total of signal levels of the image signals of respective color components, in regard to the image signals subjected to the gradation conversion process in said gradation conversion step. - View Dependent Claims (2, 3, 4, 5)
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6. An image forming apparatus which forms a color image by adhering plural coloring materials to a recording medium, comprising:
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an input unit arranged to input an image signal;
a color conversion unit arranged to perform a color conversion process to the input image signal, on the basis of profile data;
a gradation conversion unit arranged to perform a gradation conversion process to the image signal subjected to the color conversion process by said color conversion unit;
a gamma correction unit arranged to correct an output characteristic inherent in said image forming apparatus; and
a limitation unit arranged to limit the sum total of signal levels of the image signals of respective color components, in regard to the image signals subjected to the gradation conversion process by said gradation conversion unit. - View Dependent Claims (7, 8)
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Specification