Patent ID: 6459501
Filing Date: 2002-10-01
Classification: H04N

Abstract:
A small-gamut colorant set apparatus for printing mechanisms that are capable of printing from digital data, including:at least three tinting colorants having hue angles in LCH color space, namely, a first tinting colorant, a second tinting colorant, and a third tinting colorant; a first lower extreme L value of 20; a second lower extreme L value of 30; an upper extreme L value of 100; each of said first, second and third tinting colorants having a hue angle in LCH color space which is at least 60Â° different from each of the other two of said first, second and third tinting colorants; said first tinting colorant having a first L value selected from a range between said first lower and said upper extreme L values, and a first C value selected from a range between 6 and 30 at said first lower extreme L value and selected from a range between 2 and 10 at said upper extreme L value, the range limits of first C values being proportional to those at said first lower and said upper extreme L values for first L values between said first lower and said upper extreme L values; said second tinting colorant having a second L value selected from a range between said first lower and said upper extreme L values, and a second C value selected from a range between 6 and 42 at said first lower extreme L value and selected from a range between 2 and 14 at said upper extreme L value, the range of second C values being proportional to those at said first lower and said upper extreme L values for second L values between said first lower and said upper extreme L values; and said third tinting colorant having a third L value selected from a range between said second lower and said upper extreme L values, and a third C value selected from a range between 6 and 105 at said second lower extreme L value and between 2 and 40 at said upper extreme L value, the range of third C values being proportional to those at said second lower and said upper extreme L values for third L values between said second lower and said upper extreme L values.