Method of processing image data and apparatus operable to execute the same

Abstract

It is received first image data described on the basis of a first color space. It is acquired color space converting information adapted to be used to convert the first image data into second image data described on the basis of a prescribed second color space. The first image data is converted into the second image data in accordance with the color space converting information. A feature quantity is extracted from the second image data. A correction table is generated based on the feature quantity so as to include a correspondence between the second image data and third image data. The second data is corrected with reference to the correction table to generate the third image data. The third image data is converted into fourth image data described on the basis of a third color space adapted to be used to generate an image.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic view showing an image generator according to one embodiment of the invention.

FIG. 2 is a perspective view showing an external appearance of the printing apparatus incorporating the image generator.

FIG. 3 is a perspective view showing a state that a table cover of the printing apparatus is opened.

FIG. 4 is a perspective view showing a state that a scanner section of the printing apparatus is lifted up.

FIG. 5 is a schematic view showing an internal configuration of the printing apparatus.

FIG. 6 is a schematic view showing nozzles of printing heads in a printer section of the printing apparatus,

FIG. 7 is a flowchart showing an image print processing executed in the printing apparatus.

FIG. 8 is a diagram for explaining a color conversion table used in a color conversion in the image print processing.

FIG. 9 is a diagram showing a part of a dither matrix used in a halftoning in the image print processing.

FIG. 10 is a diagram showing how to judge whether dots are formed for each pixel with reference to the dither matrix.

FIG. 11 is a flowchart specifically showing an image data correction executed in the image print processing.

FIG. 12 is a diagram for explaining a principle of a correction table generation executed in the image data correction.

FIGS. 13 and 14 are graphs showing examples of a correspondence between L* values of before and after the image data correction.

FIG. 15 is a diagram for explaining the principle of the correction table generation.

FIG. 16 is a diagram for explaining a principle of a correction table generation executed in an image data correction according to a modified example.

Claims

1. A method of processing image data, comprising: receiving first image data described on the basis of a first color space;acquiring color space converting information adapted to be used to convert the first image data into second image data described on the basis of a prescribed second color space;converting the first image data into the second image data in accordance with the color space converting information;extracting a feature quantity from the second image data;generating a correction table based on the feature quantity so as to include a correspondence between the second image data and third image data;correcting the second data with reference to the correction table to generate the third image data; andconverting the third image data into fourth image data described on the basis of a third color space adapted to be used to generate an image.

2. The method as set forth in claim 1, wherein: the second color space is a colorimetric color space.

3. The method as set forth in claim 1, further comprising: generating the image based on the fourth image data.

4. A method of processing image data, comprising: receiving first image data described on the basis of a first color space;acquiring color space converting information adapted to be used to convert the first image data into second image data described on the basis of a prescribed second color space;converting the first image data into the second image data in accordance with the color space converting information;extracting a feature quantity from the second image data;correcting the second image data based on the feature quantity to generate third image data;converting the third image data into fourth image data described on the basis of a third color space adapted to be used to generate an image;generating a conversion table based on the second image data and the third image data so as to include a correspondence between the first image data and the fourth image data; andconverting the first image data into the fourth image data with reference to the conversion table.

5. The method as set forth in claim 4, wherein: the second color space is a calorimetric color space.

6. The method as set forth in claim 1, further comprising: generating the image based on the fourth image data.

7. An apparatus operable to process image data, comprising: a receiver, operable to receive first image data described on the basis of a first color space;an acquirer, operable to acquire color space converting information adapted to be used to convert the first image data into second image data described on the basis of a prescribed second color space;a first converter, operable to convert the first image data into the second image data in accordance with the color space converting information;an analyzer, operable to extract a feature quantity from the second image data;a table generator, operable to generate a correction table based on the feature quantity so as to include a correspondence between the second image data and third image data;a corrector, operable to correct the second data with reference to the correction table to generate the third image data; anda second converter, operable to convert the third image data into fourth image data described on the basis of a third color space adapted to be used to generate an image.

8. The apparatus as set forth in claim 7, wherein: the second color space is a colorimetric color space.

9. The apparatus as set forth in claim 7, further comprising: an image generator, operable to generate the image based on the fourth image data.

10. An apparatus operable to process image data, comprising: a receiver, operable to receive first image data described on the basis of a first color space;an acquirer, operable to acquire color space converting information adapted to be used to convert the first image data into second image data described on the basis of a prescribed second color space;a first converter, operable to convert the first image data into the second image data in accordance with the color space converting information;an analyzer, operable to enact a feature quantity from the second image data;a first corrector, operable to correct the second image data based on the feature quantity to generate third image data;a second converter, operable to convert the third image data into fourth image data described on the basis of a third color space adapted to be used to generate an image;a table generator, operable to generate a conversion table based on the second data and the third data so as to include a correspondence between the first image data and the fourth image data; anda third converter, operable to convert the first data with reference to the conversion table to generate the fourth image data.

11. The apparatus as set forth in claim 10, wherein: the second color space is a calorimetric color space.

12. The apparatus as set forth in claim 10, further comprising: an image generator, operable to generate the image based on the fourth image data.