Printing method using color space conversion
AssigneeSilverbrook Research Pty Ltd
InventorSimon Robert Walmsley
Life of this patent
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Abstract
A method of printing uses an image processor to convert a stored image from a first tri-color space to a second tri-color space. Resultant transformation values are read from lookup tables for each color component of the stored image pixels and a single cycle interpolator unit performs linear interpolation to generate a single color component in the second tri-color space in 14 cycles. In one example, the L*a*b* color space is converted to CMY color space. In another example, the RGB form is converted to the L*a*b* form and two extra L* components for use in sharpening a converted image.
Claims9
A method of printing comprising converting, in an image processor, image data from a first tri-color space to a second tri-color space, said converting comprising the steps of:
- reading color components of pixels of an image stored in a first tri-color space;
- executing a single interpolation in each cycle so as to perform tri-linear conversion of said color components from said first color space to said second color space, said tri-linear conversion including reading resultant transformation values in lookup tables for each of said pixel color components, and performing linear interpolations on said transformation values;
- completing said tri-linear conversion for each color component of said pixels from said first color space to said second color space in fourteen cycles;
- repeating said tri-linear conversion for each color component yet to be converted;
- and
- storing said converted color components in a specific storage location;
- the method of printing further comprising transferring converted image data to a printhead for printing by said printhead.
Dependencies are inferred from the claim text.