stayRGB color modeThe following refers to R: G: B=1:1:1, that is, the three colors of red, green and blue are equal, that is, neutral gray
When R=G=B=128, it is called "absolute neutral grey"
Fundamentals
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Neutral grey seven color light
White light passing byprismWill be divided intoHeptachromatic lightThese seven colored lights are further reduced to three primary lights, which are red, green and blue（RGB）This is the light color. The most saturated three primary lights will be restored to white light (see Figure 1).
Figure 1 Color adding mode
Figure 3 Neutral Grey
stayPrinted matterThe color is similar toLight colorThe difference is exactly the subtraction principleTricolorIt's QingMagentaSubtract the three colors from yellow to get black (see Figure 2).
However, due to impurities in the ink, in fact, the subtraction of three colors will eventually result in a dark brown color, so in order to make up for this defect, graphite is used as a supplement to black (K), soPrinting colorGeneral useCMYKFour colors.
Whether the three primary lights or the three primary colors, as long as the three colors are not completely saturatedColor Blending, it must be gray.This grey is neutral grey (see Figure 3).(But as long as the component of one color is greater than the other two colors, thenMixed colorWill be biased to this color instead of generating gray.)
Neutral grey balance
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There are innumerable colors in nature. They are all white light composed of red, green and blue light that shines on a colored object. Some color light is absorbed, some color light is reflected, and the reflected light enters the human eye to show the color of the object.If the reflected red, green and blue light enters the human eye in equal amount, the color of the object is the gray series.IfTricolorink trapping When neutral gray is reached, the three primary colors ink reaches neutral gray balance, which is calledGrey balance(orColor balance)。
In theory, the same amount of C, M, Y ink can be mixed to produce neutral gray.But in reality, the ink color effect is limited by industrialProduction conditionsC, M and Y have different color rendering capabilities. Among them, M has the strongest color rendering capability and C has the weakest color rendering capability. Therefore, the same amount of C, M and Y inks will not produce neutral gray (red gray). To obtain neutral gray, the proportion of C ink must be increased, which is the basic principle of Gray Balance.To achieve gray balance in printing and copyingColor CopyThe foundation of.
