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AssigneeCanon Kabushiki Kaisha
InventorsOkinori Tsuchiya, Shigeyasu Nagoshi, Akihiko Nakatani
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In a multi-valued printer that uses discontinuous index patterns, if a tone correction table is generated using sampled density patches, a table which is different from a table to be obtained and has no inflection point is obtained, and the print density characteristics after tone correction suffer discontinuity. To solve this problem, an output gamma table used to output measurement patches is set to linearly correct the printer print characteristics. Patches are output and their densities are measured. A reverse table of a “signal value—density” table is generated, and is smoothed using a recursive curve. The smoothed reverse table is finely adjusted to generate an intermediate output gamma table. The generated table undergoes index component correction, thus generating a tone correction table.
A generation method of generating a correction table used to correct print characteristics of a printing apparatus which has nonlinear characteristics between an input signal and a print signal to be output in accordance with the input signal, the method comprising steps of:
An image processing method of generating a correction table used to correct print characteristics of a printing apparatus which has nonlinear characteristics between an input signal and a print signal to be output in accordance with the input signal, the method comprising steps of:
A control method of a generator for generating a correction table used to correct print characteristics of a printing apparatus which has nonlinear characteristics between an input signal and a print signal to be output in accordance with the input signal, the method comprising steps of:
A control method of a generator for generating a correction table used to correct print characteristics of a printing apparatus which has nonlinear characteristics between an input signal and a print signal to be output in accordance with the input signal, the method comprising steps of:
A computer program for a generation method of generating a correction table used to correct print characteristics of a printing apparatus which has nonlinear characteristics between an input signal and a print signal to be output in accordance with the input signal, the method comprising steps of:
A computer program product storing a computer readable medium comprising a computer program code, for a generation method of generating a correction table used to correct print characteristics of a printing apparatus which has nonlinear characteristics between an input signal and a print signal to be output in accordance with the input signal, the method comprising steps of:
A computer program for a generation method of generating a correction table used to correct print characteristics of a printing apparatus which has nonlinear characteristics between an input signal and a print signal to be output in accordance with the input signal, the method comprising steps of:
A computer program product storing a computer readable medium comprising a computer program code, for a generation method of generating a correction table used to correct print characteristics of a printing apparatus which has nonlinear characteristics between an input signal and a print signal to be output in accordance with the input signal, the method comprising steps of:
A generation method of generating a correction table used to correct print characteristics of a printing apparatus which has nonlinear characteristics between an input signal and a print signal to be output in accordance with the input signal, the method comprising step of generating, on the basis of a first tone correction table which is generated while compensating for the nonlinear characteristics, a second tone correction table having a maximum value different from the first tone correction table.
A control method of generating a correction table used to correct print characteristics of a printing apparatus which has nonlinear characteristics between an input signal and a print signal to be output in accordance with the input signal, the method comprising steps of:
A computer program for a generation method of generating a correction table used to correct print characteristics of a printing apparatus which has nonlinear characteristics between an input signal and a print signal to be output in accordance with the input signal, the method comprising step of generating, on the basis of a first tone correction table which is generated while compensating for the nonlinear characteristics, a second tone correction table having a maximum value different from the first tone correction table.
A computer program product storing a computer readable medium comprising a computer program code, a generation method of generating a correction table used to correct print characteristics of a printing apparatus which has nonlinear characteristics between an input signal and a print signal to be output in accordance with the input signal, the method comprising step of generating, on the basis of a first tone correction table which is generated while compensating for the nonlinear characteristics, a second tone correction table having a maximum value different from the first tone correction table.
Dependencies are inferred from the claim text.