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US 2001/0017627 A1Published application
Gamut correction with color separation and methods and apparatuses for performing same
OwnerJonathan Marsden, Ramin Samadaniinventors
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OwnerJonathan Marsden, Ramin Samadaniinventors
Estimating the term…
Methods and apparatuses for correcting gamut limitations of a color device. A method includes creating a predefined color space for use in gamut correction due to the gamut limitations of the color device, such as a color printer, and producing a set of color data values using the predefined color space. The set of color data values is for use in converting from a first color space (e.g., RGB) to a second color space (e.g., CMYK). A method in another embodiment includes creating a first color separation table, creating a predefined color space, creating a second color separation table for converting values of colors in the predefined color space to values in a colorant space, and creating a composite color separation lookup table by using a plurality of first values from the first color separation table and using a plurality of second values from the second color separation table. The predefined color space is typically based upon a set of redefined chromaticities which are used in a transformation function. Various apparatuses of invention, including data structures in computer readable media (e.g., LUTs) and hardware and/or software combinations, are described. Methods of using these apparatuses are also described.
A method for correcting for gamut limitations of a color output device, said method comprising:
A digital processing system for correcting for gamut limitations of a color output device, said system comprising:
A method of creating a set of data values representing a color separation lookup table, said method comprising:
A method as in claim 12 further comprising:
A digital processing system for creating a set of data values representing a color separation lookup table, said system comprising:
A method of creating a set of data values representing a color separation lookup table, said method comprising:
A lookup table for providing colorant values in a colorant space given a corresponding color in a first color space, the lookup table having a first set of values and a second set of values, said first set of values derived from a first color space to colorant conversion, said first set being used to provide a colorant value for a color in the first color space which is within a gamut of an output device and said second set of values derived from a predefined color space to colorant conversion, said predefined color space for use in gamut correction due to gamut limitations of said output device, said predefined color space being specified by a set of redefined chromaticities.
Dependencies are inferred from the claim text.