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Printing apparatus, method of creating lookup table, lookup table, printing method, and printed product

A technology of a printing device and a look-up table, which is applied in the field of printing technology, can solve the problems of narrowing the color reproduction range, high price of metallic ink, and reducing the usage amount.

Active Publication Date: 2010-07-14
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, due to the relatively high price of metallic ink, it is a problem to effectively reduce its usage
Also, especially in inkjet printers, when the ink duty ratio of the color ink is high, the duty ratio limitation is extremely strict due to the amount by which the metallic ink is overlapped, and as a result, there is a problem that the color reproduction range becomes narrow
Such problems are not limited to metallic inks that contain metallic pigments that express a metallic luster. For example, when using various special glossy inks that express textures other than color development, such as inks that contain pigments that exhibit a lustrous feeling similar to pearl luster. case, it is also a common problem
In addition, it is not limited to special glossy inks in inkjet printers, but is also a common problem in various printing devices that use special glossy materials and coloring materials for printing.

Method used

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  • Printing apparatus, method of creating lookup table, lookup table, printing method, and printed product
  • Printing apparatus, method of creating lookup table, lookup table, printing method, and printed product
  • Printing apparatus, method of creating lookup table, lookup table, printing method, and printed product

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example 2

[0076] In the embodiment, the reduction point of the metallic ink S is determined by performing color measurement on the color scale, but this color measurement is not essential and can also be omitted. However, it is of course more preferable to determine the reduction point of the metallic ink S by performing colorimetry as in the embodiment, because the lightness inversion phenomenon can be reliably suppressed.

Deformed example 3

[0078] In the embodiment, the printer 20 is configured to use the LUT 62 to determine the amount of metallic ink S in the printing process, but it is not necessary to use the LUT 62 . For example, it can be pre-stored in EEPROM60 as Figure 7 The shown table describes the relationship between the ink duty ratio of the color ink and the ink duty ratio of the metallic ink S. The CPU 40 can refer to this table to determine the amount of the metallic ink S based on the ink duty ratio of the color ink. Alternatively, the amount of metallic ink S may be determined corresponding to various index values ​​related to the brightness of the color indicated by the input value of the color ink. As the index value, for example, it can be L ＊ a ＊ b ＊ L of color space ＊ Component, Y component of YCbCr color space, L ＊ u ＊ v ＊ L of color space ＊ Component, Y component of XYZ color space, etc. According to this configuration, the burden of LUT generation can be reduced.

[0079] D-4. ...

Deformed example 7

[0086] In the above-mentioned embodiment, the printer 20 executes figure 2 However, when the printer 20 is connected to a computer, part of the printing processing can be executed by the computer. In this case, the printing system composed of the computer and the printer 20 can be regarded as a printing device in a broad sense.

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PUM

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Abstract

The invention relates to a printing apparatus, a method of creating a lookup table, a lookup table, a printing method and a printing product, ensuring the printing quality and effectively saving a special gloss material. The printing apparatus (20) uses the lookup table LUT (62) having the relation of an input value in RGB type and an output value in CMYKS type (S is a metallic ink) to perform color conversion and print a metallic color. In the printing regions of below L* at an insection part L* of a linear shape representing the relationship of the tone of the printing region and L* in printing process with color ink and metallic ink (S) and a linear shape representing the relationship of the tone of the printing region and L* in printing process only with color ink, LUT (62) is set to gradually decrease the amount of the metallic ink S with the decrease in L* in the printing region.

Description

technical field [0001] The present invention relates to printing technology using special glossy materials and coloring materials for printing. Background technique [0002] Conventionally, there is known a method of first forming an undercoat layer on a printing medium and then printing on the undercoat layer (for example, Patent Document 1 below). This method can be used in various printing methods, for example, in the case of reproducing metallic colors of various shades. In order to reproduce the metallic color, for example, a layer of metallic ink is formed on a printing medium, and color ink is superimposed on it for printing. [0003] Patent Document 1: Special Publication No. 2002-530229 [0004] Patent Document 2: JP-A-2005-52984 [0005] However, since metallic ink is relatively expensive, it is an issue to effectively reduce its usage. Also, especially in inkjet printers, when the ink duty ratio of the color ink is high, the duty ratio limitation is extremely ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B41J2/01B41J3/00
CPCB41J11/0015H04N1/54
Inventor 吉田世新
Owner SEIKO EPSON CORP