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Color treatment method, apparatus, program and storaye medium, and image formation apparatus

A color processing and color technology, which is applied in image data processing, image data processing, and electrical recording process equipment using charge patterns, etc., can solve problems such as difficulty in generating color signals that meet coverage limitations

Inactive Publication Date: 2004-03-24
FUJIFILM BUSINESS INNOVATION CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Therefore, in the conventional method, when transforming a four-color color signal in a color space containing a black colorant into a color signal in a color space containing other black colorants, when the ratio Difficult to produce a color signal that meets the coverage limit when the color is consistent

Method used

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  • Color treatment method, apparatus, program and storaye medium, and image formation apparatus
  • Color treatment method, apparatus, program and storaye medium, and image formation apparatus
  • Color treatment method, apparatus, program and storaye medium, and image formation apparatus

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no. 1 approach

[0035] figure 1 is a block diagram of a color processing apparatus and method according to a first embodiment of the present invention. exist figure 1 Among them, 11 represents the equivalent output black colorant amount calculation part, 12 represents the output color signal determination part, 13 represents the limited black colorant amount calculation part, 14 represents the optimal black colorant amount calculation part, 15 represents the optimum color signal calculation part, and 16 Indicates the optimal output color signal calculation section. In the first embodiment, given that for example L * a * b * And the color signal in the target color space such as RGB and the input black colorant amount related to the color signal, and output the color signal in the output color space including the black colorant such as YMCK.

[0036] The equivalent output black colorant amount calculation section 11 calculates an equivalent output black colorant amount which is equivalent...

no. 2 approach

[0073] Figure 11 is a block diagram of a color processing apparatus and method according to a second embodiment of the present invention. Figure 11 In, the same and similar parts are used and figure 1 The same number as in , and the description of this part is omitted. Reference numeral 21 denotes a target color signal calculation section. In the second embodiment, an input color signal in an input color space containing a black colorant amount is input.

[0074] The target color signal calculation section 21 calculates, for example, device-independent L from the input color signal in the input color space. * a * b * color signals in color spaces such as space, XYZ space, and sRGB space to obtain target color signals. The color signal is calculated by inputting the input color signal into a linear regression analysis statistical method, or a color transfer characteristic prediction model composed of a neural network or the like. Again, the device-independent color spa...

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Abstract

Receiving an object color signal and an input black colorant quantity associated with the object color signal, an equivalent output black colorant quantity calculating section calculates an equivalent output black colorant quantity in an output color space equivalent to the input black colorant quantity from the input black colorant quantity. An output color signal determining section calculates an output color signal from the object color signal and the equivalent input black colorant quantity, and determines whether or not the coverage restriction is satisfied. When the coverage restriction is not satisfied, an optimum black colorant quantity is calculated by adjusting the input black colorant quantity, and an optimum color signal satisfying the coverage restriction is calculated to generate an output color signal with the optimum black colorant quantity in the restriction black colorant quantity calculating section and subsequent processings.

Description

technical field [0001] The present invention relates to a method for placing the L * a * b * A color signal in a target color space such as RGB and the amount of black colorant related to the color signal are transformed into a color signal in an output color space including a black colorant such as YMCK, or used to convert a color signal in an output color space including a black colorant such as YMCK A technology that transforms a color signal in an input color space into a color signal in an output color space including black colorants such as YMCK. Background technique [0002] In color printing of color images by electrophotography, four colors of yellow (Y), magenta (M), cyan (C) and black colorants (K) are generally used. Typical color signals fall in a three-dimensional color space such as the device-independent L * a * b * , in the L'u'V' color space or in the RGB color space when using a monitor signal. Therefore, when performing color printing of color imag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B41J2/525G03G15/01G03G21/00G06T1/00H04N1/46H04N1/60
CPCH04N1/6022
Inventor 佐佐木信小胜齐池上博章东方良介
Owner FUJIFILM BUSINESS INNOVATION CORP