Color management has been valued by more and more printing plants, basic principles and terminology of professional color management will become essential to our knowledge, only mastered this knowledge in their daily production, we can use instruments and handy The system controls our production process and achieves our quality goals.
1. Basic Color Principle
[Visible light ] 380nm to 720nm is the range of light waves that human eyes can sense. It is called "visible light", and outside this range is "invisible light"
[ Invisible light ] Below 380nm is ultraviolet light, X-ray, gamma rays, cosmic rays, etc .; Above 720nm is infrared rays, microwave rays, radar rays, radio rays, etc.
[Sunlight ] Sunlight includes visible light and invisible light. For the human eye, the light wave range is from 400nm to 500nm is blue light, 500nm to 600nm is green light, and 600nm to 700nm is red light
[Additive color system ] Red (R), green (G), and blue (B) light are called the three primary colors in the additive color system , and mixing them can produce any color. Red (R) + Green (G) = Yellow (Y), Green (G) + Blue (B) = Cyan (C), Blue (B) + Red (R) = Magenta ( M). When equal amounts of the three primary colors of light are combined, white light appears. Cyan (C), magenta (M), and yellow (Y) lights are the relative colors of red (R), green (G), and blue (B) lights, respectively, and any pair of relative color lights mixed together will also produce white light.
[Subtractive color system] There are also three primary colors in pigments (including printing inks), namely cyan (C), magenta (M) and yellow (Y) colors, which belong to the subtractive color system , which is the opposite of the three primary colors in the additive color system. Adding two colored lights will produce brighter colors, and mixing two pigments will produce darker colors because the pigment absorbs part of the visible light. In theory, the mixing of the three primary colors CMY in the pigment can produce any color, including black; in fact, their mixing will only produce some colors, and the mixing of the same amount of CMY will only produce dark brown, not black. The reason is that today's pigments are not completely ideal, so black and spot colors are needed in printing inks to fill this shortcoming.
C yan green
M agenta magenta
Y ellow
Blac K black
R ed red
G reen green
B lue blue
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