Image processing device for modifying tone characteristics of im

Details Image processing device for modifying tone characteristics of im Image processing device for modifying tone characteristics of im

1999-05-17

2000-09-26

Johns, Andrew W.

Image analysis

Color image processing

Color correction

358518, G06K 900

Patent

active

061252026

ABSTRACT:
Tone calculation for conversion from input image data X to produce converted data Y is performed in accordance with a functional formula including at least two of a first-order term of the input image data X, a second-order term of the input image data X, a third-order term of the input image data X, and a fraction term of the input image data X. In another aspect, color conversion from image data R, G and B to produce printing data C, M and Y by generating complementary color data Ci, Mi and Yi from the image data, determining a minimum value .alpha. and a maximum value .beta. of the complementary color data, generating hue data r, g, b, c, m and y from the complementary color data, the minimum value and the maximum value, generating predetermined matrix coefficients, and determining printing data C, M and Y in accordance with a predetermined matrix calculation using the minimum value, the hue data, and the matrix coefficients.

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