Smooth gray component replacement strategy that utilizes the full device gamut
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United States of America Patent
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Aug 12, 2008
Grant Date -
Jul 15, 2004
app pub date -
Jan 15, 2003
filing date -
Jan 15, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
Systems and methods are disclosed of a smooth gray component replacement strategy which utilizes the full gamut of a printer device. A CMY to CMYK gray component replacement transform is disclosed which inherently exploits the full gamut of the printer, by transforming points in CMY cube to L*a*b* color space, scaling the obtained values so they fill the maximum gamut obtainable with the printer device and calculating the CMYK values needed to obtain the scaled L*a*b* values. The CMY to CMYK transform is then smoothed with an averaging filter that does not change CMYK values at the corners. The entire color gamut is adequately sampled and small changes in CMY do not produce large jumps in L*a*b*.
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