Additive colors is a method for creating colors by mixing different colors of light, with shades of red, green, and blue as the primary colors most commonly used in additional color systems.
Additive colors are different from subtractive colors, where colors are created by reducing (absorbing) parts of the light spectrum present in ordinary white light, using colored pigments or colors, such as those in paint, ink, and three colored layers in color photographs which is typical on film.
The combination of two standard three-color primary additives in the same proportion produces secondary color additives - cyan, magenta or yellow - which, in the form of dyes or pigments, are the standard primary colors in subtractive color systems. The subtractive system using primary which is secondary to the additive system can be seen as an alternative approach to reproduce the various colors by controlling the relative amount of red, green, and blue light that reaches the eye.
Computer and television monitors are the most common additive color samples. Tests with powerful magnifying lenses will reveal that each pixel in a CRT, LCD and most types of color video displays consists of red, green and blue sub-pixels, light combining in various proportions to produce all other colors. as well as white and gray. Colored sub-pixels do not overlap on the screen, but when viewed from a normal distance, they overlap and blend into the retina of the eye, producing the same results as external superimpositions.
Other examples of additive colors can be found in overlapping projected lamp colors that are often used in theater lighting for drama, concerts, circus performances and nightclubs.
The overall colors available in additional color systems are defined by all possible combinations of all possible luminosity of each major color in the system. In chromatic space, the whole is a convex polygon field with an angle in the introduction. For the three introductions, it is a triangle.
The results obtained when mixing additive colors are often contrary to intuition for people who are accustomed to the color system of pigments, dyes, inks and other substances that color the eye color with reflection rather than emission. For example, in a subtractive color system, green is a combination of yellow and cyan; in additional colors, red plus green makes yellow. The additive color is the result of the way the eye detects color, and is not a light property. There is a big difference between pure spectral yellow light, with a wavelength of about 580 nm, and a mixture of red and green light. However, they both stimulate our eyes in the same way, so we do not detect that difference, and both are the yellow light to the human eye. (See eye (cytology), color vision.)
Video Additive color
History
The additional color system was motivated by Young-Helmholtz's theory of trichromatic color vision, articulated sometime around 1850 by Hermann von Helmholtz, based on earlier work by Thomas Young. For his experimental work on the subject, James Clerk Maxwell is sometimes credited as the father of color additive. He asked the photographer Thomas Sutton to photograph the tartan tape on a black and white movie three times, first in red, then green, then a blue filter over the lens. Three black-and-white images are developed and then projected onto a screen with three different projectors, each equipped with a red, green, or blue filter used to take a picture. When brought to the alignment, three images (black-and-red, black-green and black-and-blue images) form a colorful image, thus showing the additive color principles.
Maps Additive color
Example
The following chart shows an example of additive mixing and perfomance perception, step by step.
To fully understand the process, it must be shown how dull colors are obtained using cyan, magenta, and yellow instead of red, green, and blue.
See also
- Mixing colors
- Color space
- Color theory
- Color picture movie
- Kinemacolor
- Prizma Color
- RGB color model
- Subtractive colors
- Technicolor
- William Friese-Greene
References
External links
- RGB and CMYK Color system.
- http://www.edinphoto.org.uk/1_P/1_photographers_maxwell.htm - Photos and stories from the James Clerk Maxwell Foundation.
- Stanford University CS 178 Interactive Flash demo that compares additive and subtractive color mixing.
Source of the article : Wikipedia
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