Back to results
US 8,576,441 B2Granted
Profile correcting method
AssigneeBrother Kogyo Kabushiki Kaisha
InventorRyuji Yamada
Life of this patent
Estimating the term…
Abstract
A profile correcting method includes: acquiring a device profile indicating correspondence relationships between a plurality of input values and a plurality of sets of first output values, each first output value set corresponding to one of the plurality of input values, each input value representing an achromatic color having a density level, each first output value set including a plurality of chromatic values each representing a chromatic color, the achromatic color being reproduced by mixing the chromatic color; and, performing a process for each input value.
Claims6
A profile correcting method comprising:
- acquiring a device profile indicating correspondence relationships between a plurality of input values and a plurality of sets of first output values, each first output value set corresponding to one of the plurality of input values, each input value representing an achromatic color having a density level, each first output value set including a plurality of chromatic values each representing a chromatic color, the achromatic color being reproduced by mixing the chromatic color;
- and
- performing a process for each input value, the process comprising:
- forming a test patch based on one first output value set corresponding to the each input value;
- measuring color of the test patch, the color being represented by a set of a*b* values, the a*b* value set including a first a* value and a first b* value which are defined in a CIEL*a*b* color space;
- determining whether or not the one first output value set is a to-be-corrected first output value set, the to-be-corrected first output value set corresponding to a test patch whose color is represented by an a* b* value set including at least one of the first a* value greater than an a* prescribed value and the first b* value greater than a b* prescribed value, the a* prescribed value and the b* prescribed value being smaller than zero;
- and
- correcting, if the one first output value set is the to-be-corrected first output value set, the one first output value set to a second output value set which is to form color that is represented by an a* b* value set including a second a* value and a second b* value, the second a* value being smaller than or equal to the a* prescribed value, the second b* value being smaller than or equal to the b* prescribed value.
5 more elements
A profile correcting device comprising:
- an acquiring unit that is configured to acquire a device profile indicating correspondence relationships between a plurality of input values and a plurality of sets of first output values, each first output value set corresponding to one of the plurality of input values, each input value representing an achromatic color having a density level, each first output value set including a plurality of chromatic values each representing a chromatic color, the achromatic color being reproduced by mixing the chromatic color;
- a performing unit that is configured to perform a process for each input value, the performing unit including:
- a control unit that is configured to control an image forming device to form a test patch based on one first output value set corresponding to the each input value;
- a measuring unit that is configured to measure color of the test patch, the color being represented by a set of a*b* values, the a*b* value set including a first a* value and a first b* value which are defined in a CIEL*a*b* color space;
- a determining unit that is configured to determine whether or not the one first output value set is a to-be-corrected first output value set, the to-be-corrected first output value set corresponding to a test patch whose color is represented by an a*b* value set including at least one of the first a* value greater than an a* prescribed value and the first b* value greater than a b* prescribed value, the a* prescribed value and the b* prescribed value being smaller than zero;
- and
- a correcting unit that is configured to correct, if the determining unit determines that one first output value set is the to-be-corrected first output value set, the one first output value set to a second output value set which enables the image forming device to form color that is represented by an a*b* value set including a second a* value and a second b* value, the second a* value being smaller than or equal to the a* prescribed value, the second b* value being smaller than or equal to the b* prescribed value.
4 more elements
Dependencies are inferred from the claim text.