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Image processing apparatus and method, and profile generating method
| Details |
Inventors: Ohga, Manabu;
Assignee: Canon Kabushiki Kaisha (Tokyo, JP)
Primary Examiner: Ahmed; Samir
Assistant Examiner: Bhatnagar; Anand
Attorney, Agent or Firm: Fitzpatrick, Cella, Harper & Scinto
If gamut mapping (hue restoration) defined by one Lab color space is applied in color matching under different reference white points, the human vision perceives the hue as inconsistent. In view of this, input data which is dependent on a color space of an input device is converted by the conversion LUT 11 to color space data which is independent of any devices, based on a viewing condition at the time of viewing an input original. The data is converted to data in the human color perception space by the forward converter 12, then subjected to gamut mapping, and converted back to data in the color space independent of any devices by the inverse converter 15, based on a viewing condition at the time of viewing an output original. Then, the data is converted to output data in a color space which is dependent on an output device by the conversion LUT 16. |
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DETAILED DESCRIPTION The present invention is made in consideration of the above situation, and has as its object to provide an image processing apparatus and method for performing color matching, which enables human vision to perceive a constant hue even under different viewing conditions, and a method of generating a profile.
In order to attain the above object, the present invention provides an image processing apparatus for performing color matching process, the image processing apparatus comprising: first converting means for converting input image data in a color space dependent on an input device to first data, in accordance with a viewing condition at the time of viewing an input original in an independent color space which is independent of any device; second converting means for converting the first data to second data in a human color perception space; third converting means for converting the second data to third data in accordance with a viewing condition at the time of viewing an output original in the independent color space; and fourth converting means for converting the third data to image data to be outputted to an output device in a color space dependent on the output device.
Another object of the present invention is to provide an image processing apparatus and method capable of performing, at high precision and high speed, color matching corresponding to an ambient light without being limited to data of the device-independent color space based on a particular illuminant, and to provide a method of generating a profile.
In order to attain the above object, the present invention provides a profile generating method for generating a profile dependent on a viewing condition, the method comprising the steps of: converting color target data in independent color space to data in a human color perception space based on a condition for measuring the color target data; and converting the data in the color perception space to data in an independent color space, which is independent of any device, based on the viewing condition so as to generate the profile
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