JPH05261943A - Color printing method by ink jet printer - Google Patents

Abstract

PURPOSE:To express various types of tones with different brightness, chroma and hue assuredly without using the white base of an image receiving paper itself. CONSTITUTION:Plural types of inks with different concentrations for respective three color inks of yellow, magenta and cyan are previously prepared, and the ink concentration, combination and number of times for overlapping to be used are selected, corresponding with specified colors of a body to be printed, to expressed specified hue, brightness and chroma.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color printing method, and more particularly to a full color printing method using an ink jet printer.

[0002]

2. Description of the Related Art Conventionally, in a color printing method using a general jet printer, for example, only four colors of yellow (Y), magenta (M), cyan (C) and black are used, and an area gradation using a dither method is used. By the method, each primary color is given a gradation, and these are appropriately overlapped to express a full color.

[0003]

However, in this method, the white background of the image receiving paper itself must be used in order to express a light color tone having a high lightness. For this reason, the dots stand out visually, and it is difficult to perceive a smooth color tone, and there is a natural limit in expressing a light color tone.

The present invention was devised under such circumstances, and its purpose is to provide different lightness, saturation, and hue without using a white background of the image receiving paper itself as in the prior art. An object of the present invention is to provide a color printing method using an inkjet printer that can reliably express various color tones.

[0005]

In order to solve the above problems, the present invention relates to a color printing method using an ink jet printer, wherein each of the three color inks of yellow, magenta and cyan is previously used as a color printing ink. , A plurality of types of ink having different densities are prepared, the ink density, the combination and the number of times of overlapping are selected to be used in correspondence with the predetermined color of the subject, and the predetermined hue
I tried to express the brightness and saturation.

A specific embodiment will be described below by taking an example in which three kinds of ink densities are used for each of three colors of yellow, magenta and cyan. First, as stock solutions, three stock solution inks of yellow (hereinafter simply referred to as Y), magenta (hereinafter simply referred to as M), and cyan (hereinafter simply referred to as C) having physical properties as shown in Table 1 below are prepared. did.

[0007]

[Table 1] Each of these stock solutions is diluted with pure water 500 times, 10 times
It was diluted to 00 times and 50,000 times. The spectral characteristics of these diluted solutions were measured. The resulting maximum absorption wavelength (λmax.) And absorbance (Abs.) Are shown in Table 2 below. From the results shown in Table 2, there is no change in the color tone even when diluted, which is different from the value of λmax.

[0008]

[Table 2] Next, FIG. 1 shows the results of plotting the chromaticity coordinates of the sample by appropriately superimposing the inks with an ink jet printer using three types of ink concentrations including diluted ones. The values plotted in FIG. 1 are Y, M,
Each C is independent.

In FIG. 1, white circles are Y, M, C, and 20 respectively.
Represents a 0-fold dilution, white triangles Δ are Y, M, C,
Each represents a 50-fold dilution, the white squares □ represent the ones using the stock solution, the black squares ■ represent the one-time application of the stock solution, and each number represents the number of times the ink has been overlaid.

From these results, it was confirmed that by using the inks having the above-mentioned three kinds of densities, various color tones having different lightness and saturation and different hues can be expressed by predetermined superposition.

From these results, it was also confirmed that the density range required for each ink is represented by Table 3 when expressed by the Abs. Value of λmax.

[0012]

[Table 3] Next, FIG. 2 shows the result of plotting the chromaticity coordinates of the sample in a wider range by using the stock solutions of Y, M, and C and the ink diluted 20-fold of the stock solution, and appropriately overlapping the inks. It was The relationship between the sample number and the number of times each ink is overlaid is shown in Table 4 below.

[0013]

[Table 4] From these results, it was further confirmed that it is possible to express various color tones having different lightness, saturation, and hue by the predetermined superposition using the above ink.

[0014]

According to the present invention, a plurality of types of ink having different densities are prepared in advance for each of the three color inks of yellow, magenta, and cyan as the ink for color printing, and the predetermined color of the subject is obtained. According to the above, the ink density, combination, and number of times of superposition are selected for use to express the specified hue, lightness, and saturation. In other words, it is possible to reliably express various color tones having different lightness, saturation, and hue.

[Brief description of drawings]

[FIG. 1] A predetermined ink is appropriately used in an inkjet printer.
It is the graph which plotted the chromaticity coordinate of the sample which piled up.

[FIG. 2] A predetermined ink is appropriately used in an inkjet printer.
It is the graph which plotted the chromaticity coordinate of the sample which overlapped.

Claims (1)

[Claims] 1. In a color printing method using an inkjet printer, a plurality of types of ink having different densities are prepared in advance for each of the three color inks, yellow, magenta, and cyan, as ink for color printing, and a predetermined color of a subject is determined. A color printing method using an inkjet printer, characterized in that a predetermined hue, lightness, and saturation are expressed by selecting an ink density, a combination, and the number of times of superimposition to be used corresponding to each color.