Facsimile and static presentation processing – Natural color facsimile – Color correction
Patent
1998-04-13
2000-04-25
Williams, Kimberly A.
Facsimile and static presentation processing
Natural color facsimile
Color correction
382167, G03F 308, G06K 900
Patent
active
060550740
ABSTRACT:
In a color correcting apparatus, transformation errors in an entire color space can be uniformly reduced in response to a characteristic of an input/output appliance, and a high precision color correction can be achieved. A first reference table is formed by storing input color signals produced by reading a reference color chip by using a color image scanner in correspondence with measurement values produced by measuring the reference color chip by employing a calorimeter. A calculation is made of a transformation coefficient for transforming input color signals into measurement values based on the input color signals close to lattice points defined in a color space, and also the measurement values corresponding thereto. The color data of the respective lattice points are corrected by using the transformation coefficient. Then, a second reference table is formed by storing the color data of the lattice points in correspondence with the corrected color data of the lattice points. The color correction process operation is performed for the image data entered from the image input apparatus with employment of the second reference table.
REFERENCES:
patent: 5610732 (1997-03-01), Komatsu
patent: 5659406 (1997-08-01), Imao et al.
patent: 5664072 (1997-09-01), Ueda et al.
patent: 5801853 (1998-09-01), Yamada et al.
patent: 5809213 (1998-09-01), Bhattacharjya
Matsushita Electric - Industrial Co., Ltd.
Williams Kimberly A.
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