Color management system having business graphics rendering mode

Claim 2

A business graphics rendering technique for rendering colors in a color image more vividly, comprising the steps of: determining, for each color of plural colors, whether the color is a chromatic color or an achromatic neutral color; for a chromatic color, increasing color contrast by increasing ink amounts for high-value ink amount colors and/or decreasing ink amounts for low-value ink amount colors; and for an achromatic neutral color, leaving ink amounts essentially unaltered.

Claim 3

A business graphics rendering technique according to claim 1, wherein said determining step determines whether each color of the plural colors is a chromatic color or an achromatic neutral color by reference to a saturation value of the color in HLS space.

Claim 4

A business graphics rendering technique according to claim 1, wherein said determining step determines whether each color of the plural colors is a chromatic color or an achromatic neutral color by comparison of each of plural ink amounts of the color to determine whether the ink amounts yield a visually neutral color.

Claim 5

A business graphics rendering technique according to claim 1, wherein for chromatic colors, ink amounts are altered independently of values of other ink amounts.

Claim 6

A business graphics rendering technique according to claim 4, wherein ink amounts are altered based on an S-shaped curve.

Claim 7

A business graphics rendering technique according to claim 4, wherein each ink amount is reduced.

Claim 8

A business graphics rendering technique for rendering colors in a color image more vividly, comprising the steps of: determining, for each color of plural colors, whether the color is a chromatic color or an achromatic neutral color; for a chromatic color, increasing color contrast by increasing ink amounts for high-value ink amount colors and by decreasing ink amounts for low-value ink amount colors; and for an achromatic neutral color, leaving ink amounts essentially unaltered.

Claim 9

A business graphics rendering technique for rendering colors in a color image more vividly, comprising the steps of: determining, for each color of plural colors, whether the color is a chromatic color or an achromatic neutral color; for a chromatic color, increasing color contrast by increasing ink amounts for high-value ink amount colors and by decreasing ink amounts for low-value ink amount colors; and for an achromatic neutral color, leaving ink amounts essentially unaltered.

Claim 10

A business graphics rendering technique according to claim 7, wherein said determining step determines whether each color of the plural colors is a chromatic color or an achromatic neutral color by reference to a saturation value of the color in HLS space.

Claim 11

A business graphics rendering technique according to claim 7, wherein said determining step determines whether each color of the plural colors is a chromatic color or an achromatic neutral color by comparison of each of plural ink amounts of the color to determine whether the ink amounts yield a visually neutral color.

Claim 12

A business graphics rendering technique according to claim 7, wherein for chromatic colors, ink amounts are altered independently of values of other ink amounts.

Claim 13

A business graphics rendering technique according to claim 10, wherein ink amounts are altered based on an S-shaped curve.

Claim 14

A business graphics rendering technique according to claim 10, wherein each ink amount is reduced.

Claim 15

A business graphics rendering technique for obtaining printer colorant values for each RGB color in a color image containing plural such RGB colors, comprising the steps of: a first converting step of converting each RGB color into HLS coordinates so as to obtain a saturation value for the RGB color; a second converting step of converting the HLS coordinates into printer colorant values; determining, based on the saturation value obtained in said first converting step, whether the RGB color is a chromatic color or an achromatic neutral color; for a chromatic color, increasing color contrast by increasing colorant amount of high-valued printer colorant values and/or decreasing colorant amounts of low-valued printer colorant values; and for an achromatic neutral color, leaving printer colorant amounts essentially unaltered.

Claim 16

A business graphics rendering technique for obtaining printer colorant values for each RGB color in a color image containing plural such RGB colors, comprising the steps of: a first converting step of converting each RGB color into HLS coordinates so as to obtain a saturation value for the RGB color; a second converting step of converting the HLS coordinates into printer colorant values; determining, based on the saturation value obtained in said first converting step, whether the RGB color is a chromatic color or an achromatic neutral color; for a chromatic color, increasing color contrast by increasing colorant amount of high-valued printer colorant values and/or decreasing colorant amounts of low-valued printer colorant values; and for an achromatic neutral color, leaving printer colorant amounts essentially unaltered.

Claim 17

A business graphics rendering technique according to claim 13, wherein for chromatic colors, colorant amounts are altered independently of values of other colorant amounts.

Claim 18

A business graphics rendering technique according to claim 14, wherein colorant amounts are altered based on an S-shaped curve.

Claim 19

A business graphics rendering technique according to claim 14, where each colorant amount is reduced.

Claim 20

A color management system having plural selectable rendering modes, one of the plural rendering modes being selected so as to render a color image, said color management system comprising: a first rendering mode which includes first process steps and a look-up table, the look-up table storing printer colorant values for each of plural colors, wherein the process steps include steps to interpolate between look-up table values so as to derive printer colorant values corresponding to an input color; a second color rendering mode which includes second process steps to derive printer colorant values for an input color without reference to a look-up table which stores plural such printer colorant values for each of plural colors; and a selector for selecting one of the plural rendering modes which include said first mode and said second mode.

Claim 21

A color management system having plural selectable rendering modes, one of the plural rendering modes being selected so as to render a color image, said color management system comprising: a first rendering mode which includes first process steps and a look-up table, the look-up table storing printer colorant values for each of plural colors, wherein the process steps include steps to interpolate between look-up table values so as to derive printer colorant values corresponding to an input color; a second color rendering mode which includes second process steps to derive printer colorant values for an input color without reference to a look-up table which stores plural such printer colorant values for each of plural colors; and a selector for selecting one of the plural rendering modes which include said first mode and said second mode.

Claim 22

A color management system according to claim 17, wherein each of the first and second process steps include process steps for storing, in a cache, printer colorant values for input colors previously encountered.

Claim 23

A color management system according to claim 17, wherein said second mode is comprised by a business graphics rendering mode which renders input colors with increased overall color contrast.

Claim 24

A color management system according to claim 19, wherein in said business graphics rendering modes, for chromatic colors, high-valued printer colorant amounts are increased, and/or low-valued printer colorant amounts are decreased.

Claim 25

A color management system according to claim 19, wherein in said business graphics rendering mode, for achromatic neutral colors, printer colorant amounts are left unaltered.

Claim 26

A color management system according to claim 17, wherein said first mode is comprised by one of a perceptual rendering mode and a colorimetric rendering mode, and wherein said second mode is comprised by a business graphics rendering mode.