Patent ID: 6829061
Filing Date: 2004-12-07
Classification: H04N

Abstract:
A method for converting monitor color values to gray levels to be reproduced by a color or monochrome rendering device which employs a single color marking media to achieve gray levels, the method comprising the steps of:a) applying a gamma correction function to said monitor color values; b) converting the monitor color values corrected in step a) to a luminance value (Y) through use of following expression: Y=YR(R)+(YGâˆ’kG)(G)+(YB+kB) â€ƒwhere: YR, YG, and YB are coefficients that provide a luminance value for said corrected monitor color values; kG and kB are correction values for lightening said G component and darkening said B component, respectively; and wherein kG=kB, and wherein kG and kB have values >0 and <0.2.