Hottest printing image information processing 4

2022-08-11
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Printing image information processing

2. Brightness

turn on the power and describe the brightness of color as the value of light (i.e. the energy of light) in photometry. It can be measured with photometer. It is generally believed that if the reflectivity of the surface of colored objects is high, their brightness is large. As shown in Figure 3-12, from the perspective of spectral reflection, the hue of a and B is the same, but the brightness of color a is greater than that of B, so there are differences between color a and color B visually

figure 3-12 brightness difference

3. Saturation

saturation (also known as chromaticity) refers to the purity of color, and all kinds of monochromatic light of visible light is the most saturated color. When the spectral color is mixed with more white light components, the more unsaturated it is. Professor Zhang Liqun believes that the saturation of an object's color depends on the selectivity of the reflected spectral radiation on the surface of the object. If an object has high reflectivity to a narrow band of the spectrum, but has very low reflectivity to other wavelengths or does not reflect, the saturation of this color is high. As shown in Figure 3-13, the spectral reflectance curve a shows higher color saturation than curve B

figure 3-13 difference in saturation

(V) color stereo

in order to understand the relationship between the three characteristics of color, the hue, brightness and saturation can be expressed in three-dimensional space. As shown in Figure 3-14, the vertical axis represents the brightness change of black-and-white series. The upper end is white, the lower end is black, and the middle is various grays of transition workers. The hue is represented by a circle on the horizontal plane. The center of the circle is gray, and the points on the circle represent different hues in the visible spectrum (red, orange, yellow, green, green, blue, purple). The saturation of the color gradually increases from the center of the circle to the outside, and the saturation of the colors on the circle is the largest. When changing from the downward or upward direction of the circle, the saturation of the color also decreases

the automatic uniform cooling and constant temperature color stereo of the sample by the color arrival shown in Figure 3-14 is an idealized model. Although it can not more truly represent the relationship between the three characteristics of color, it can help people understand the relationship between the three characteristics of color

figure 3-14 idealized color stereo

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