How to improve hue saturation
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1. Hue
Hue is the most basic feature of color. People call colors such as red, yellow, green, etc. according to hue. The hue is determined by the color of the object's optic nerve reflected from the surface of the object. For monochromatic light, it can be determined by the wavelength of its light. In the case of a color composed of mixed light, the hue is determined in proportion to the amount of light of the various wavelengths of the mixed light. For example, in daylight, the surface of the printed matter reflects the color light with a wavelength of 500-550 nm, while the color light of other wavelengths is relatively absorbed, the printed matter is visually green.
The hue can be represented by the shape of the spectral reflectance curve, the curve A indicates that the hue of the object is green, and the curve B indicates that the hue of the object is greenish blue.
2. brightness
The brightness of a color is photometrically described as the value of light (ie, the energy of light). It can be measured with a photometer. It is generally believed that the reflectivity of the surface of colored objects is high, and their brightness is large. The hue of the two colors of A and B is the same, but the brightness of the A color is greater than B, so the two colors of A and B are visually different. .
3. saturation
Saturation (also called chroma) refers to the purity of the color, and the various monochromatic lights visible are the most saturated colors. The more white light components are incorporated into the spectral color, the less saturated it is.
The saturation of an object's color depends on the selectivity of the surface's reflected spectral radiation. The object has a high reflectivity for a narrower band of the spectrum, and the reflectivity for other wavelengths is low or no. The saturation of this color is high.
1. Side by side
The bright-toned parts of the color prints have relatively small dot coverage in the corresponding parts of the yellow, magenta, cyan, and black plates and the original highlights, and the dot distribution is sparse. Therefore, the dots of the bright portion of the printed matter are mostly in a side-by-side state.
When the yellow dot and the magenta dot are juxtaposed, white light is irradiated onto the yellow dot, the yellow dot absorbs blue light, and red light and green light are reflected; white light is irradiated onto the magenta dot, and the magenta dot absorbs green light, reflecting red light and Blu-ray. The four color lights are mixed in space, and according to the color light addition method, red light, green light, and blue light are mixed into white light, and the rest is red light. If the distance between the two dots is very small, they are very close to each other, and the human eye sees red. By the same token, magenta and green dots are juxtaposed to see the blue, green dots and yellow mesh points are juxtaposed to see the green.
When two dots are juxtaposed, the resulting color is colored on one side of the large dot, such as a large green dot and a small Lvhong dot, and the resulting color is cyan.
When the three dots of yellow, magenta and cyan are juxtaposed, since the ink absorbs part of the color light, the paper also absorbs the color light differently, and cannot reflect the color light 100%. When the distance between the dots is small, the human eye sees gray.
2. Overlay of dots
The dark tone part of the color print, the yellow, magenta, cyan, and black print plates and the corresponding dark mark of the original have a relatively large dot rate, and the dot is dense, so the dots of the dark portion of the print are mostly in a superimposed state.
When the magenta dot is superimposed on the yellow dot, the white light is first irradiated onto the magenta dot, the green light in the white light is absorbed, the red light and the blue light are transmitted to the yellow dot, and the blue light is absorbed by the yellow dot through the magenta. The dots are illuminated to white, and only the red light is reflected from the paper surface, and the red color is seen by the human eye. By the same token, Lu Hong and Qing Lian points overlap with the human eye to see the blue color, and the green mesh point and the yellow mesh point overlap to see the green color. When the yellow, magenta, and cyan dots are stacked together, the blue, green, and red light in the white light are absorbed, and the human eye sees black.