Three properties of color of the hottest printing

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Three attributes of color in printing and packaging

in order to compare all kinds of color lights and colors, which is not the most effective process. For the correct analysis and distinction, the three attributes of distinguishing colors are uniformly stipulated internationally, which are hue, lightness and saturation

1. Hue (hue)

hue is the characteristic that colors differ from each other. Light with different wavelengths in the visible spectrum visually shows various hues, including red, orange, yellow, green, blue, and purple. It is usually called red, orange and yellow as warm colors, green, blue and purple as cold colors, and green as intermediate colors

the hue of the light source depends on the feeling of the human eye on the spectral components of its radiation; The hue of the object depends on the spectral composition introduced by the human eye to the low-temperature groove category of the light source and the feeling produced by the radiation of various wavelengths on the surface of the object, which is easy to cause damage to the small piston and oil leakage (transmission)

for example, in sunlight, an object reflects radiation in the wavelength range of 480~560nm and absorbs radiation of other wavelengths, then the surface of the object is green

2. Lightness

lightness refers to the visual lightness and darkness produced by the stimulation of light. Because the lightness of color is a psychophysical quantity, it is not only affected by the energy of light reflected or transmitted by the object itself, but also related to the illumination of the whole field of view

in the achromatic series, the closer the color of an object is to white, the higher its reflection of light and the higher its brightness. On the contrary, the closer it is to black, the lower its reflectance of light and the lower its brightness. For color objects, the higher the light reflectance of their surface, the higher the brightness and the brighter the color. For example, the spectral reflectance of the yellowish brown object surface is higher than that of the red object surface, which can produce a higher sense of brightness to the human eye. Therefore, the brightness of the yellowish brown object is higher than that of the red object

3, saturation. Saturation refers to the purity of color, which indicates the selection degree of reflected or transmitted light of an object. The saturation of each monochromatic light in the visible spectrum is the highest

in the law of color substitution, it is pointed out that any color C can be matched by the mixture of a certain amount of monochromatic light C with a wavelength of and a certain amount of white light W. The formula is:

C = C + W

therefore, the saturation of a color can be understood as the proportion of monochromatic light matching the color in all color lights. If s represents saturation, then

s = C/C = C/(c + W) for achromatic, there is only brightness difference, and there is no color coincidence saturation

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