Printing device, printing method and program thereof
First Claim
1. A printing device for printing an output print image by forming dots in pixels arranged on a printing medium based on an input image data, the printing device comprising:
- a printing unit including a print head for performing a color printing, the printing unit prints the output print image such that formation of the dots in a common region is divided into at least first and second pixel groupswherein when 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 input image data 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 the output print image in each of the plurality of conditions is less than value 2 as a change of b*;
(B) when the input image data 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 output print image in each of the plurality of 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 input image data 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 output print image in each of the plurality of conditions is less than value 0.5 as a change of L*.
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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 an output print image by forming dots in pixels arranged on a printing medium based on an input image data, the printing device comprising:
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a printing unit including a print head for performing a color printing, the printing unit prints the output print image such that formation of the dots in a common region is divided into at least first and second pixel groups wherein when 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 input image data 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 the output print image in each of the plurality of conditions is less than value 2 as a change of b*;(B) when the input image data 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 output print image in each of the plurality of 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 input image data 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 output print image in each of the plurality of 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 of an output print image by forming dots in pixels arranged on a print medium based on an input image data, the printing method comprising:
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a printing process including performing printing of the output print image such that formation of the dots in a common region is divided into at least first and second pixel groups; 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 input image data 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 the output print image in each of the plurality of conditions is less than value 2 as a change of b*;(B) when the input image data 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 output print image in each of the plurality of 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 input image data 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 output print image in each of the plurality of conditions is less than value 0.5 as a change of L*.
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12. A non-transitory computer readable medium storing a computer program executed by a computer to perform color printing of an output print image by forming dots in pixels arranged on a print medium comprising:
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a printing function including performing printing of the output print image such that formation of the dots in a common region is divided into at least first and second pixel groups; 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 input image data 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 the output print image in each of/he plurality of conditions is less than value 2 as a change of b*;(B) when the input image data 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 output print image in each of the plurality of 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 input image data 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 output print image in each of the plurality of 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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the printing device including a printing unit that prints an output print image by forming dots in pixels arranged on a printing medium based on an input image data such that formation of the dots in a common region is divided into at least first and second pixel groups; wherein when 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 input image data is yellow (RGB value;
R=0=255, B=0 to 64, when RGB value is 8 bit conversion), color difference in CIEL*a*b* color space of the output print image in each of the plurality of conditions is less than value 2 as a change of b*;(B) when the input image data 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 output print image in each of the plurality of 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 input image data 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 output print image in each of the plurality of conditions is less than value 0.5 as a change of L*.
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Specification