PRINTING DEVICE, PRINTING METHOD AND PROGRAM THEREOF
First Claim
1. A printing device for printing and forming dots on a printing medium comprising:
- a printing unit that prints an image;
wherein the printing of the image is performed such that when the dots are formed on the printing medium in accordance with dot data indicating existence or non-existence of a dot formation per each pixel, the dot formation is divided into at least first and second pixel groups, and at least a portion of dot formation in the first and second pixel groups is performed in a common region;
wherein the printing unit includes a print head for performing a color printing by multiple color dots in a resolution N (N is a natural number of more than
180) dot per inch (dpi), and when the printing is performed in each of a plurality of conditions of which a relative position between the first pixel group and the second pixel group is different, at least one of following conditions is satisfied;
(A) when the printed image is yellow (RGB value;
R=G=255, B=0 to 64, when RGB value is 8 bit conversion), color difference in CIEL*a*b* color space of images printed in each of the plurality of different conditions is less than value 2 as a change of b*;
(B) when the printed image is magenta (RGB value;
R=B=255, G=0 to 64, when RGB value is 8 bit conversion), the color difference in CIEL*a*b* color space of the images printed in each of the plurality of different conditions is less than value 0.5 as a change of L* or less than value 0.5 as a change of a*; and
(C) when the printed image is cyan (RGB value;
G=B=255, R=0 to 64, when RGB value is 8 bit conversion), the color difference in CIEL*a*b* color space of the images printed in each of the plurality of different conditions is less than value 0.5 as a change of L*.
1 Assignment
0 Petitions
Accused Products
Abstract
A printing device includes the following features. The first dot group in which dots are formed based on the first printing condition and the second dot group in which dots are formed based on a printing condition which is different from the first printing condition are formed together in a common region. In the common region, when the printing is performed in a plurality of conditions such that a difference of the dot pitch between a formation position of dots belonging to the first pixel group and a formation position of dots belonging to the second pixel group is 2/720 inch to 5/720 inch, the change in CIEL*a*b* of the printed image is within the preliminary determined range.
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Citations
13 Claims
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1. A printing device for printing and forming dots on a printing medium comprising:
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a printing unit that prints an image; wherein the printing of the image is performed such that when the dots are formed on the printing medium in accordance with dot data indicating existence or non-existence of a dot formation per each pixel, the dot formation is divided into at least first and second pixel groups, and at least a portion of dot formation in the first and second pixel groups is performed in a common region; wherein the printing unit includes a print head for performing a color printing by multiple color dots in a resolution N (N is a natural number of more than
180) dot per inch (dpi), and when the printing is performed in each of a plurality of conditions of which a relative position between the first pixel group and the second pixel group is different, at least one of following conditions is satisfied;(A) when the printed image is yellow (RGB value;
R=G=255, B=0 to 64, when RGB value is 8 bit conversion), color difference in CIEL*a*b* color space of images printed in each of the plurality of different conditions is less than value 2 as a change of b*;(B) when the printed image is magenta (RGB value;
R=B=255, G=0 to 64, when RGB value is 8 bit conversion), the color difference in CIEL*a*b* color space of the images printed in each of the plurality of different conditions is less than value 0.5 as a change of L* or less than value 0.5 as a change of a*; and(C) when the printed image is cyan (RGB value;
G=B=255, R=0 to 64, when RGB value is 8 bit conversion), the color difference in CIEL*a*b* color space of the images printed in each of the plurality of different conditions is less than value 0.5 as a change of L*. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A printing method for performing color printing by forming color dots on a print medium in a resolution N (N is a natural number of more than 180) dot per inch (dpi), the printing method comprising:
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a printing process to print an image; wherein the printing process includes performing the printing of the image such that when the dots are formed on the printing medium in accordance with dot data indicating existence or non-existence of a dot formation per each pixel, the dot formation is divided into at least first and second pixel groups, and at least a portion of dot formation in the first and second pixel groups is performed in a common region; wherein the printing process includes performing in each of a plurality of conditions of which a relative position between the first pixel group and the second pixel group is different, at least one of following conditions is satisfied; (A) when the printed image is yellow (RGB value;
R=G=255, B=0 to 64, when RGB value is 8 bit conversion), color difference in CIEL*a*b* color space of images printed in each of the plurality of different conditions is less than value 2 as a change of b*;(B) when the printed image is magenta (RGB value;
R=B=255, G=0 to 64, when RGB value is 8 bit conversion), the color difference in CIEL*a*b* color space of the images printed in each of the plurality of different conditions is less than value 0.5 as a change of L* or less than value 0.5 as a change of a*; and(C) when the printed image is cyan (RGB value;
G=B=255, R=0 to 64, when RGB value is 8 bit conversion), the color difference in CIEL*a*b* color space of the images printed in each of the plurality of different conditions is less than value 0.5 as a change of L*.
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12. A program executed by a computer to perform color printing by forming color dots on a print medium in a resolution N (N is a natural number of more than 180) dot per inch (dpi) comprising:
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a printing function to print an image; wherein the printing function includes performing the printing of the image such that when the dots are formed on the printing medium in accordance with dot data indicating existence or non-existence of a dot formation per each pixel, the dot formation is divided into at least first and second pixel groups, and at least a portion of dot formation in the first and second pixel groups is performed in a common region; wherein the printing function includes performing in each of a plurality of conditions of which a relative position between the first pixel group and the second pixel group is different, at least one of following conditions is satisfied; (A) when the printed image is yellow (RGB value;
R=G=255, B=0 to 64, when RGB value is 8 bit conversion), color difference in CIEL*a*b* color space of images printed in each of the plurality of different conditions is less than value 2 as a change of b*;(B) when the printed image is magenta (RGB value;
R=B=255, G=0 to 64, when RGB value is 8 bit conversion), the color difference in CIEL*a*b* color space of the images printed in each of the plurality of different conditions is less than value 0.5 as a change of L* or less than value 0.5 as a change of a*; and(C) when the printed image is cyan (RGB value;
G=B=255, R=0 to 64, when RGB value is 8 bit conversion), the color difference in CIEL*a*b* color space of the images printed in each of the plurality of different conditions is less than value 0.5 as a change of L*.
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13. A printing system including a computer and a printing device connected with the computer comprising:
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a printing unit that prints an image; wherein the printing of the image is performed such that when the dots are formed on the printing medium in accordance with dot data indicating existence or non-existence of a dot formation per each pixel, the dot formation is divided into at least first and second pixel groups, and at least a portion of dot formation in the first and second pixel groups is performed in a common region; wherein the printing unit includes a print head for performing a color printing by multiple color dots in a resolution N (N is a natural number of more than
180) dot per inch (dpi), and when the printing is performed in each of a plurality of conditions of which a relative position between the first pixel group and the second pixel group is different, at least one of following conditions is satisfied;(A) when the printed image is yellow (RGB value;
R=G=255, B=0 to 64, when RGB value is 8 bit conversion), color difference in CIEL*a*b* color space of images printed in each of the plurality of different conditions is less than value 2 as a change of b*;(B) when the printed image is magenta (RGB value;
R=B=255, G=0 to 64, when RGB value is 8 bit conversion), the color difference in CIEL*a*b* color space of the images printed in each of the plurality of different conditions is less than value 0.5 as a change of L* or less than value 0.5 as a change of a*; and(C) when the printed image is cyan (RGB value;
G=B=255, R=0 to 64, when RGB value is 8 bit conversion), the color difference in CIEL*a*b* color space of the images printed in each of the plurality of different conditions is less than value 0.5 as a change of L*.
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Specification