Printer gradation correction method and color patch image
First Claim
1. A printer gradation correcting method, comprising the steps of:
- outputting a plurality of color patch images different in gradation on a recording medium by a printer based on image data of a plurality of color patch images;
measuring a gradation of each of the plurality of outputted color patch images by a color measuring device so as to obtain a plurality of different gradation measurement values; and
correcting a gradation characteristic of the printer based on the plurality of different gradation measurement values;
wherein each of the plurality of color patch images includes a patch-shaped image having a uniform gradation of a predetermined gradation representative value different from other color patch images and gradation fluctuation added in the patch-shaped image, and the added gradation fluctuation includes high gradation components each having a gradation value higher than the predetermined gradation representative value and low gradation components each having a gradation value lower than the predetermined gradation representative value and is configured such that a total gradation value of the high gradation components and the low gradation components measured in a measurement region by the color measuring device becomes a predetermined value, andwherein when the gradation characteristic of the printer is corrected, the gradation value of at least one of the plurality of color patch images is determined based on the gradation representative value, the predetermined value of the total gradation value of the high gradation components and the low gradation components, and the gradation measurement value.
1 Assignment
0 Petitions
Accused Products
Abstract
A printer gradation correcting method, comprises the steps of: outputting a color patch image by a printer based on image data of a color patch image; measuring a gradation of the outputted color patch image by a color measuring device so as to obtain a gradation measurement value; and correcting a gradation characteristic of the printer based on the gradation measurement value. The color patch image includes a patch-shaped image having a uniform gradation of a predetermined gradation representative value and gradation fluctuation of a predetermined color component added in the patch-shaped image, and the added gradation fluctuation is structured such that a total of gradation fluctuation measured in a measurement region by the color measuring device becomes a predetermined value. The gradation characteristic of the printer is corrected based on the gradation representative value, the predetermined value of the total of gradation fluctuation, and the gradation measurement value.
25 Citations
21 Claims
-
1. A printer gradation correcting method, comprising the steps of:
-
outputting a plurality of color patch images different in gradation on a recording medium by a printer based on image data of a plurality of color patch images; measuring a gradation of each of the plurality of outputted color patch images by a color measuring device so as to obtain a plurality of different gradation measurement values; and correcting a gradation characteristic of the printer based on the plurality of different gradation measurement values; wherein each of the plurality of color patch images includes a patch-shaped image having a uniform gradation of a predetermined gradation representative value different from other color patch images and gradation fluctuation added in the patch-shaped image, and the added gradation fluctuation includes high gradation components each having a gradation value higher than the predetermined gradation representative value and low gradation components each having a gradation value lower than the predetermined gradation representative value and is configured such that a total gradation value of the high gradation components and the low gradation components measured in a measurement region by the color measuring device becomes a predetermined value, and wherein when the gradation characteristic of the printer is corrected, the gradation value of at least one of the plurality of color patch images is determined based on the gradation representative value, the predetermined value of the total gradation value of the high gradation components and the low gradation components, and the gradation measurement value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
-
-
14. A color patch image, comprising:
-
a plurality of color patch images which are different in gradation and formed on a recording medium, wherein each of the plurality of color patch images includes; a patch-shaped image having a uniform gradation of a predetermined gradation representative value different from other color patch images; and gradation fluctuation added in the patch-shaped image, wherein the added gradation fluctuation includes high gradation components each having a gradation value higher than the predetermined gradation representative value and low gradation components each having a gradation value lower than the predetermined gradation representative value and is configured such that a total gradation value of the high gradation components and the low gradation components measured in a measurement region by the color measuring device becomes a predetermined value.
-
-
15. A printer gradation correcting method, comprising the steps of:
-
outputting a color patch image by a printer based on image data of a color patch image; measuring a gradation of the outputted color patch image by a color measuring device so as to obtain a gradation measurement value; and correcting a gradation characteristic of the printer based on the gradation measurement value; wherein the color patch image includes a patch-shaped image having a uniform gradation of a predetermined gradation representative value and gradation fluctuation of a predetermined color component added in the patch-shaped image, and the added gradation fluctuation is structured such that a total of gradation fluctuation measured in a measurement region by the color measuring device becomes a predetermined value, wherein the gradation characteristic of the printer is corrected based on the gradation representative value, the predetermined value of the total of gradation fluctuation, and the gradation measurement value, and wherein a gradation pattern image is outputted by the printer based on gradation pattern image data added with gradation fluctuation of a predetermined color component, the outputted gradation pattern image is measured by the color measuring device so as to obtain an amplitude of gradation fluctuation for each gradation value, and a gradation value to cause a tone jump of the predetermined color component is determined based on the size of the amplitude of each gradation value. - View Dependent Claims (16, 17, 18, 19)
-
-
20. A printer gradation correcting method, comprising the steps of:
-
outputting a color patch image by a printer based on image data of a color patch image; measuring a gradation of the outputted color patch image by a color measuring device so as to obtain a gradation measurement value; and correcting a gradation characteristic of the printer based on the gradation measurement value; wherein the color patch image includes a patch-shaped image having a uniform gradation of a predetermined gradation representative value and gradation fluctuation of a predetermined color component added in the patch-shaped image, and the added gradation fluctuation is structured such that a total of gradation fluctuation measured in a measurement region by the color measuring device becomes a predetermined value, wherein the gradation characteristic of the printer is corrected based on the gradation representative value, the predetermined value of the total of gradation fluctuation, and the gradation measurement value, and wherein two kinds of color patch images having the same gradation representative value and different respective amplitudes of gradation fluctuations are outputted by the printer, and whether or not the number of kinds of color patch images is to be increased is determined in accordance with a difference in measurement values between the outputted two kinds of color patch images.
-
-
21. A printer gradation correcting method, comprising the steps of:
-
outputting a color patch image by a printer based on image data of a color patch image; measuring a gradation of the outputted color patch image by a color measuring device so as to obtain a gradation measurement value; and correcting a gradation characteristic of the printer based on the gradation measurement value; wherein the color patch image includes a patch-shaped image having a uniform gradation of a predetermined gradation representative value and gradation fluctuation of a predetermined color component added in the patch-shaped image, and the added gradation fluctuation is structured such that a total of gradation fluctuation measured in a measurement region by the color measuring device becomes a predetermined value, wherein the gradation characteristic of the printer is corrected based on the gradation representative value, the predetermined value of the total of gradation fluctuation, and the gradation measurement value, and wherein when there is a region including discontinuous points in a different portion image between a standard image of a color patch image and the outputted color patch image or in a differential image of the outputted color patch image, the region is not made as the measurement region by the measuring device.
-
Specification