Image processing apparatus and method

Claim 2

An image processing apparatus comprising: a look-up table that stores data indicating whether or not each of a plurality of representative points lies within a color-reproduction range of an output device; entry means for entering image data having a plurality of color components; and judging means for performing interpolation processing by referring to said look-up table in accordance with the entered image data, and judging whether or not the entered image data lies within the color-reproduction range of the output device based on output data provided by the interpolation processing, wherein said look-up table stores data representative of all points located at sides of a solid comprised by the plurality of color components and which are out of the color-reproduction range of the output device.

Claim 3

The apparatus according to claim 1, wherein the entered image data is comprised of three color components, and the solid is a cube.

Claim 4

The apparatus according to claim 1, further comprising holding means for holding characteristics of the output device, the characteristics including at least a 3×3 matrix for transforming the entered image data to a color space dependent upon the output device, and a one-dimensional look-up table for linearly correcting image data transformed by the 3×3 matrix.

Claim 5

The apparatus according to claim 3, wherein said look-up table, the 3×3 matrix, and the one-dimensional look-up table are stored in a profile according to International Color Consortium stipulations.

Claim 6

The apparatus according to claim 1, further comprising holding means for holding characteristics of an input device, which is a source of the entered image data, the characteristics including at least chromaticity coordinates and a tonality characteristic curve of a color space dependent upon the input device.

Claim 7

An image processing method comprising the steps of: providing a look-up table that stores data indicating whether or not each of a plurality of representative points lies within a color-reproduction range of an output device; entering image data having a plurality of color components; and performing interpolation processing by referring to the look-up table in accordance with the entered image data, and judging whether or not the entered image data lies within the color-reproduction range of the output device based on output data provided by the interpolation processing, wherein the look-up table stores data representative of all points located at sides of a solid comprised by the plurality of color components and which are out of the color-reproduction range of the output device.

Claim 8

An image processing method comprising the steps of: providing a look-up table that stores data indicating whether or not each of a plurality of representative points lies within a color-reproduction range of an output device; entering image data having a plurality of color components; and performing interpolation processing by referring to the look-up table in accordance with the entered image data, and judging whether or not the entered image data lies within the color-reproduction range of the output device based on output data provided by the interpolation processing, wherein the look-up table stores data representative of all points located at sides of a solid comprised by the plurality of color components and which are out of the color-reproduction range of the output device.

Claim 9

The method according to claim 6, wherein the entered image data is comprised of three color components, and the solid is a cube.

Claim 10

The method according to claim 6, further comprising the step of holding characteristics of the output device, the characteristics including at least a 3×3 matrix for transforming the entered image data to a color space dependent upon the output device, and a one-dimensional look-up table for linearly correcting image data transformed by the 3×3 matrix.

Claim 11

The method according to claim 6, further comprising the step of holding characteristics of an input device, which is a source of the entered image data, the characteristics including at least chromaticity coordinates and a tonality characteristic curve of a color space dependent upon the input device.

Claim 12

A computer readable memory storing program codes for performing an image processing method, the program codes comprising: code for entering image data having a plurality of color components; and code for performing interpolation processing by referring to a look-up table that stores data indicating whether or not each of a plurality of representative points lies within a color-reproduction range of an output device in accordance with the entered image data, and judging whether or not the entered image data lies within the color-reproduction range of the output device based on output data provided by the interpolation processing, wherein the look-up table stores data representative of all points located at sides of a solid comprised by the plurality of color components and which are out of the color-reproduction range of the output device.

Claim 13

A computer readable memory storing program codes for performing an image processing method, the program codes comprising: code for entering image data having a plurality of color components; and code for performing interpolation processing by referring to a look-up table that stores data indicating whether or not each of a plurality of representative points lies within a color-reproduction range of an output device in accordance with the entered image data, and judging whether or not the entered image data lies within the color-reproduction range of the output device based on output data provided by the interpolation processing, wherein the look-up table stores data representative of all points located at sides of a solid comprised by the plurality of color components and which are out of the color-reproduction range of the output device.

Claim 14

A look-up table for use with an image processor that judges whether or not entered image data lies within a color-reproduction range of an output device, comprising: a table storing data indicating whether or not each of a plurality of representative points lies within the color-reproduction range of the output device, wherein the image processor enters image data having a plurality of color components, performs interpolation processing by referring to said look-up table in accordance with the entered image data, and judges whether or not the entered image data lies within the color-reproducing range of the output device based on output data provided by the interpolation processing, and wherein the stored data represents all points that are located at sides of a solid comprised by the plurality of color components and that are out of the color-reproducing range of the output device.

Claim 15

A look-up table for use with an image processor that judges whether or not entered image data lies within a color-reproduction range of an output device, comprising: a table storing data indicating whether or not each of a plurality of representative points lies within the color-reproduction range of the output device, wherein the image processor enters image data having a plurality of color components, performs interpolation processing by referring to said look-up table in accordance with the entered image data, and judges whether or not the entered image data lies within the color-reproducing range of the output device based on output data provided by the interpolation processing, and wherein the stored data represents all points that are located at sides of a solid comprised by the plurality of color components and that are out of the color-reproducing range of the output device.