Color processing apparatus and method
AssigneeCanon Kabushiki Kaisha
InventorYoshiko Iida
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Abstract
In order to implement color conversion which makes images output using different recording sheets appear to have the same color appearance, mapping points and mapping parameters used to obtain an output gamut having a shape similar to that of the gamut of an input color space are determined on the basis of input color space information and output gamut information, and a mapping gamut used to convert an input color signal into an output color signal is generated using the mapping points and mapping parameters.
Claims27
A color processing method to convert an input signal into an output color signal, comprising the steps of:
- determining mapping points and mapping parameters required to obtain an output gamut having a shape similar to a shape of an input gamut of an input color space on the basis of information of the input color space and information of the output gamut;
- and
- generating a mapping output gamut used in color conversion using the mapping points and mapping parameters.
A color processing apparatus to convert an input signal into an output color signal, comprising:
- a determiner, arranged to determine mapping points and mapping parameters required to obtain an output gamut having a shape similar to a shape of an input gamut of an input color space on the basis of information of the input color space and information of the output gamut;
- and
- a generator, arranged to generate a mapping output gamut used in color conversion using the mapping points and mapping parameters.
A computer program product storing a computer readable medium having a computer program code, for a color processing method to convert an input color signal into an output color signal, the product comprising process procedure codes for:
- determining mapping points and mapping parameters required to obtain an output gamut having a shape similar to a shape of an input gamut of an input color space on the basis of information of the input color space and information of the output gamut;
- and
- generating a mapping output gamut used in color conversion using the mapping points and mapping parameters.
A color processing method to convert an input signal into an output color signal, comprising the steps of:
- determining mapping points and mapping parameters required to obtain an output gamut having a shape similar to a shape of an input gamut of an input color space on the basis of information of the input color space and information of the output gamut;
- generating a mapping output gamut used in color conversion using the mapping point and mapping parameters;
- forming a color conversion profile on the basis of the mapping output gamut;
- evaluating a color conversion result of a predetermined evaluation color using the profile;
- and
- correcting the mapping points within a predetermined range on the basis of the evaluation result, and re-executing generation of the mapping output gamut and generation of the profile.
A color processing apparatus to convert an input signal into an output color signal, comprising:
- a determiner, arranged to determine mapping points and mapping parameters required to obtain an output gamut having a shape similar to a shape of an input gamut of an input color space on the basis of information of the input color space and information of the output gamut;
- a generator, arranged to generate a mapping output gamut used in color conversion using the mapping point and mapping parameters;
- a former, arranged to form a color conversion profile on the basis of the mapping output gamut;
- an evaluation section, arranged to evaluate a color conversion result of a predetermined evaluation color using the profile;
- and
- a controller, arranged to correct the mapping points within a predetermined range on the basis of the evaluation result, and re-execute generation of the mapping output gamut and generation of the profile.
A computer program product storing a computer readable medium having a computer program code, for a color processing method to convert an input color signal into an output color signal, the product comprising process procedure codes for:
- determining mapping points and mapping parameters required to obtain an output gamut having a shape similar to a shape of an input gamut of an input color space on the basis of information of the input color space and information of the output gamut;
- generating a mapping output gamut used in color conversion using the mapping point and mapping parameters;
- forming a color conversion profile on the basis of the mapping output gamut;
- evaluating a color conversion result of a predetermined evaluation color using the profile;
- and
- correcting the mapping points within a predetermined range on the basis of the evaluation result, and re-executing generation of the mapping output gamut and generation of the profile.
A color processing method to convert an input signal into an output color signal, comprising the steps of:
- acquiring regional information indicating an observation environment of an output image;
- acquiring information associated with color spaces of image input and output devices;
- generating color processing parameters on the basis of the regional information and information associated with the color space;
- and
- forming a profile used to convert an input color signal into an output color signal using the generated color processing parameters.
A color processing method to convert an input signal into an output color signal, comprising the steps of:
- a first obtaining section, arranged to acquire regional information indicating an observation environment of an output image;
- a second obtaining section, arranged to acquire information associated with color spaces of image input and output devices;
- a generator, arranged to generate color processing parameters on the basis of the regional information and information associated with the color space;
- and
- a former, arranged to form a profile used to convert an input color signal into an output color signal using the generated color processing parameters.
A computer program product storing a computer readable medium having a computer program code, for a color processing method to convert an input color signal into an output color signal, the product comprising process procedure codes for:
- acquiring regional information indicating an observation environment of an output image;
- acquiring information associated with color spaces of image input and output devices;
- generating color processing parameters on the basis of the regional information and information associated with the color space;
- and
- forming a profile used to convert an input color signal into an output color signal using the generated color processing parameters.
A color processing method of performing a color conversion to convert an input signal into an output color signal, comprising the steps of:
- determining mapping points and mapping parameters required to obtain similar color appearances by human visible perception from different output media, wherein shapes of gamut of the media are different from each other;
- and
- mapping the gamut to output gamut by using the determined mapping points and mapping parameters to perform the color conversion.
Dependencies are inferred from the claim text.