Image processing apparatus and image processing method

Abstract

An image processing apparatus comprising: a first color conversion table in which a relation in conversion from a color in a first color space to a color in a second color space is recorded; a second color conversion table in which a relation in conversion from a color in a third color space to a color in the second color space is recorded; a first color converting means for converting a color in the first color space into a color in the second color space; a gamut creating means for creating a gamut; a second color converting means for converting a color in the second color space into a color in the gamut; a color conversion table creating means for creating a third color conversion table; and a third color converting means for converting a color in the gamut into a color in the third color space.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic block diagram of a printing system including an image processing apparatus in accordance with the invention;

FIG. 2 is a functional block diagram of an image processing apparatus in accordance with the invention;

FIG. 3 is a perspective view illustrating a relation of plural color spaces existing in a color space formed independently of devices; and

FIG. 4 is a flowchart showing an operation of an image processing apparatus in accordance with the invention.

Claims

1. An image processing apparatus comprising: a first color conversion table in which a relation in conversion from a color in a first color space formed dependently on an inputted image to a color in a second color space formed independently of devices is recorded;a second color conversion table in which a relation in conversion from a color in a third color space formed dependently on an output device to a color in the second color space is recorded;a first color converting means for converting a color in the first color space into a color in the second color space on the basis of the first color conversion table;a gamut creating means for creating a gamut of the output device in the second color space on the basis of the second color conversion table;a second color converting means for converting a color in the second color space into a color in the gamut in accordance with gamut mapping using the gamut;a color conversion table creating means for creating a third color conversion table created by reversely converting the second color conversion table, the third color conversion table wherein a relation in conversion from a color in the second color space to a color in the third color space is recorded, the third color conversion table including a fourth color space in the shape of a rectangular parallelepiped including the gamut so that an outer surface of the gamut would inscribe the rectangular parallelepiped, the fourth color space being formed independently of devices; anda third color converting means for converting a color in the gamut included in the fourth color space into a color in the third color space on the basis of the third color conversion table.

2. The image processing apparatus according to claim 1, wherein the second color space is a CIELAB space.

3. An image processing method comprising: a first color converting step for converting, on the basis of a first color conversion table in which a relation in conversion from a color in a first color space formed dependently on an inputted image to a color in a second color space formed independently of devices is recorded, a color in the first color space into a color in the second color space;a gamut creating step for creating, on the basis of a second color conversion table in which a relation in conversion from a color in a third color space formed dependently on an output device to a color in the second color space is recorded, a gamut of the output device in the second color space;a second color converting step for converting a color in the second color space into a color in the gamut in accordance with gamut mapping using the gamut;a color conversion table creating step for creating a third color conversion table created by reversely converting the second color conversion table, the third color conversion table wherein a relation in conversion from a color in the second color space to a color in the third color space is recorded, the third color conversion table including a fourth color space in the shape of a rectangular parallelepiped including the gamut so that an outer surface of the gamut would inscribe the rectangular parallelepiped, the fourth color space being formed independently of devices; anda third color converting step for converting a color in the gamut included in the fourth color space into a color in the third color space on the basis of the third color conversion table.

4. The image processing method according to claim 3, wherein the second color space is a CIELAB space.