1. Color conversion
In nature, all colors are composed of different wavelengths of light. When light passes through the prism, you can see the spectrum produced by various wavelengths of light. "Spectrum" can be said to be a natural phenomenon of continuous color mixing, but we can use it to define color changes and further manage the required colors. On TVs, movies, computers and screens, we all use the "additive color method" to deal with color changes. It contains three main colors: Red, Green, and Blue (Red, Green, and Blue), which are known as the three primary colors (R, G, and B). All colors can be overlapped by these three different colors of light. But for the printed matter, the human eye judges the difference in color by reflecting light. When I see a piece of red paper, because the light is originally shining on the paper, the red light in the spectrum reflects, so I know it is red of. Therefore, the "subtractive color method" must be used to define colors on the printed matter, that is, the so-called C, M, Y (Cyan, Cyan, Magenta, Yellow) three-color model. For colored light, red, green, and blue can be mixed with white light, but when using watercolor or paint to paint, you will find that the color will become deeper and deeper. The addition of red, green, and blue is not white.
Therefore, use the complementary characteristics of the three colors C, M, and Y to create and change a variety of different colors. However, since the addition of the three colors C, M, and Y cannot mix pure black, the color printer separates the black (Black) to form a complete set of C, M, Y, and K subtractive color reduction models for more Perfect print quality. The quality of color printing must be able to present colors truly; "addition principle" and "subtraction principle" are two major systems in chromatics, how to accurately convert the color of the light source system (R, G, B) to inkjet or The printing system (C, M, Y, K) is a very complicated knowledge, but only by accurately converting the colors can we get real high-quality effects. Therefore, accurate color conversion technology is a key factor affecting print quality.
Second, the resolution
For black-and-white laser printers, resolution may be the key to print quality, but for color printers, color scale and resolution are equally important. DPI resolution is written by DotPerInch, which means how many dots can be printed on 1 inch width. For black-and-white laser printers, the higher the resolution, the finer the resolution and gradation points, and the better the print quality. But for color printers, resolution refers to how many ink dots can be printed on a 1 inch width, regardless of whether the ink dots overlap.
Third, the color scale
An output image (image) is composed of many points (or pixels), and each point forms this image with different colors and brightness. For example, on the monitor of a TV or a computer, a beautiful picture quality can be presented, which makes our eyes feel very vivid. However, the resolution on the computer monitor is 640 × 480dpi or 1600 × 1200dpi, and the resolution of the TV is even lower. Because the color uses an analog output method, the voltage is used to control the color, so that each point can be displayed in a continuous tone (full tone). So even if the resolution is lower than the printer, it still feels very natural and realistic, so the color scale is also very important. Therefore, some printers use six colors to print colors, and the original C, M, Y, and K colors are added with another light blue and light red colors. This has the advantage that when mixing colors, it is no longer just through The original C, M, Y, and K colors are used for coloring, but the color quality is closer to continuous gradation through 6 colors. As the number of primary colors on the graph increases, the image becomes more realistic.
4. Print head control
The ink dots are sprayed onto the paper through the nozzle. Generally speaking, the nozzle and the print head are made together, so the technology of the print head itself is very important, and the left and right print head is the inkjet technology and the printer cantilever gear, transmission The precision of the belt.
5. Ink
Printing ink can be divided into two types: DyeType and PigmentType. Dye type ink has better saturation, but poor water resistance; while pigment type ink is less saturated than dye type, but has good water resistance. At present, inkjet inks are mostly dye-based, such as Epson and Canon C, M, Y, K four-color all-purpose dye-based ink. The ink of the inkjet printer must have sufficient surface tension to prevent the ink from splashing out when ejected. In addition, the ink must also have quick-drying properties to prevent blooming on the paper. Therefore, the ink itself is also one of the factors that affect the print quality.
Sixth, the material to be printed
All the prints to be printed have an important relationship with the paper materials used. Just like we go to the photo gallery to develop photos, we can get different effects on different photo papers. In the case of inkjet printers, because each type of paper uses different paper fibers, the ability to absorb ink is also different. Of course, the performance is also different. Of course, the quality of glossy photos is best represented by photo paper; and ordinary documents can be plain paper or inkjet paper.
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