The process of distinguishing various ink properties by physical or chemical methods.
1 color, color colour Light affects the human eye and causes visual characteristics other than the image. a. Visual phenomena or visible radiation characteristics that observers can use to distinguish differences in the two fields of view with the same size, shape, and structure. b. The characteristics of light stimulation that produce the above feeling. For example: red light, white light, etc. c. Characteristics of objects that can cause light irritations. For example, red paper red, black cloth black and so on.
2 Colour colours refers to a variety of colours except achromatic colours, each with different shades, brightness and saturation.
3 achromatic (achromatic colors) achromatic colours means a series of neutral gray from white to black, only the difference in brightness, no hue and saturation characteristics, when the reflectance of the light wave of the visible spectrum of the object is more than 80% It is white, and when it is 4% or less, it is black. Between these two, it is gray with various brightness. 4 The Munsell colour system is a systematic method for classifying and calibrating the color, brightness and hue of a surface with a three-dimensional model.
5 hue (hue) hue means red, yellow, green, blue, purple, and other color characteristics. One of the three attributes of color.
6 Saturation Saturation refers to the degree of color purity. The purer the color, the more eclectic it feels to feel.
7 lightness a. The relative darkness of the surface of the object. b. Measure the visual properties of the object surface with the white board as a reference under the same lighting conditions. One of the three attributes of color.
8 CIE colour system CIE colour system is the theory and method of the international lighting committee to express and measure color systems.
9 Tristimulus values ​​The amount of three original stimulus required to match the color of the light to be measured in a three-color system.
10 Chromaticity chroma uses the visual characteristics of distance and brightness without color points to represent the measurement of the color shade on the surface of an object. One of the three attributes of color.
11 Chromaticity refers to the total amount of hue and saturation. Therefore, when color is used to describe colors, brightness is not considered.
12 The chromaticity coordinates refers to the relative proportions of the stimuli of the color reversed (transmission) color light in the total stimuli of the three primary colors of red, green, and blue, which are mostly represented by x, y, and z. 13 Colour difference colour difference refers to the difference between two colors, expressed as â–³ E.
13.1 Colorimeter The colorimeter is a colorimetric instrument that measures the reflected color (or transmitted color) photometric integral using the standard light source illumination inside the instrument. It can directly measure the tristimulus values ​​of the object color X, Y, Z, and the chromaticity coordinates x, y z, the coordinate values ​​L*, a*, b*, and the total color difference ΔE of the three-dimensional rectangular coordinate system.
14 reflection densitometer is a device with standard light source and convertible red, green, and blue primary color filters to determine the density value of three-color or four-color inks. The formula can be used to calculate the intensity of the measured ink color. Color shift, gray scale, and efficiency were evaluated as the color quality of the ink.
15 Hue error Also known as hue error, the ink color sample is measured and calculated by a reflection densitometer to indicate the deviation of the ink color from the ideal three primary colors.
16 Gray-scale grayness refers to the ratio of low-density and high-density values ​​measured by a reflection densitometer in an ink color sample, and is used to indicate the relative purity of the ink color.
17 Efficiency efficiency means that the ink color sample is measured by a reflection densitometer to indicate the color efficiency of the ink applied to three- or four-color printing.
18 color strength color strength refers to the maximum density of the ink color sample measured by a reflection densitometer, used to evaluate the range and depth of the color produced by ink overprint.
19 Primary colour The specific colour used in the colour matching experiment. Three primary colors are generally used, and any one of the three primary colors cannot be mixed by the other two primary colors.
20 Primary colors Three primary colours In the ink industry, the three primary colors of yellow, magenta, and cyan, which are the dominant wavelengths, are called primary colors.
20.1 Secondary color Secondary color refers to the intermediate colors of any two colors in the three primary colors.
21 Compound color refers to a color that is a mixture of two or more colors.
22 Complementary colour Any two-color blend can become achromatic colors called complementary colors.
23 Toptone refers to the color of the thin layer of ink scraped on the scratch paper.
24 Background undertone refers to the color of the scratch paper with a thin layer of ink that is displayed under illumination.
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