Claims
- 1. An image processing apparatus for performing an image process so as to visually match a light source color with a material color, comprising:input means for inputting image data regarding the material color; and converting means for converting the image data regarding said material color into image data regarding said light source color, wherein said converting means performs a conversion process so as to satisfy a relation shown by a curve which monotonously increases and is convex upward on a coordinates plane in which a luminance of the material color is set to an axis of abscissa and a luminance of the light source color is set to an axis of ordinate.
- 2. An apparatus according to claim 1, further having:first correcting means for correcting the image data regarding said material color on the basis of input characteristic of an input device and outputting the corrected image data regarding the material color to said converting means; and second correcting means for performing a correction according to output characteristic of an output device to the image data regarding the light source color.
- 3. An apparatus according to claim 1, wherein said converting means executes the conversion process in accordance with an observation light source.
- 4. An apparatus according to any one of claims 1 to 3, wherein the following equations of Haubner, P are used in said conversion process of converting the luminance:H=Ct(φ)Ltn−H0(Lu, φ) H0(Lu, φ)=Ct(φ)[S0(φ)+S1(φ)Lun]where,H is sense of brightness of a stimulus Lt; Lt is luminance of an examination field of view of an apparent size, angle of view, φ, expressed by a minute; Lu is luminance of an ambient field of view having an angle of view of 180° around the examination field of view; Ct(φ), S0(φ), S1(φ) are functions, and n is a constant.
- 5. An image processing method for performing an image process so that a light source color is visually matched with a material color, comprising:an input step of inputting image data regarding the material color; and a converting step of converting the image data regarding said material color into image data regarding the light source color, wherein in said converting step, a conversion process is executed so as to satisfy a relation shown by a curve which monotonously increases and is convex upward on a coordinates plane in which a luminance of the material color is set to an axis of abscissa and a luminance of the light source color is set to an axis of ordinate.
- 6. A recording medium which stores a program to realize an image processing method for performing an image process so that a light source color is visually matched with a material color, comprising:an input step of inputting image data regarding the material color; and a converting step of converting the image data regarding said material color into image data regarding the light source color, wherein in said converting step, a conversion process is executed so as to satisfy a relation shown by a curve which monotonously increases and is convex upward on a coordinates plane in which a luminance of the material color is set to an axis of abscissa and a luminance of the light source color is set to an axis of ordinate.
Priority Claims (2)
Number |
Date |
Country |
Kind |
7-255402 |
Oct 1995 |
JP |
|
8-244845 |
Sep 1996 |
JP |
|
CROSS-REFERENCES TO RELATED APPLICATIONS
This is a divisional of application Ser. No. 08/724,463, filed on Oct. 1, 1996, now U.S. Pat. No. 6,344,900.
US Referenced Citations (11)
Number |
Name |
Date |
Kind |
4379292 |
Minato et al. |
Apr 1983 |
A |
4773761 |
Sugiyama et al. |
Sep 1988 |
A |
4812903 |
Wagensonner et al. |
Mar 1989 |
A |
5072305 |
Numakura et al. |
Dec 1991 |
A |
5157464 |
Laihanen |
Oct 1992 |
A |
5181105 |
Udagawa et al. |
Jan 1993 |
A |
5254978 |
Beretta |
Oct 1993 |
A |
5363197 |
Ohno et al. |
Nov 1994 |
A |
6118455 |
Hidaka et al. |
Sep 2000 |
A |
6198553 |
Yamamoto et al. |
Mar 2001 |
B1 |
6240204 |
Hidaka et al. |
May 2001 |
B1 |
Foreign Referenced Citations (1)
Number |
Date |
Country |
07258631 |
Oct 1995 |
JP |