Even though most words in this paragraph are spelt wrong, it is still easily legible and easy to read. The brain when reading a word reads to first and last letter an from memory puts one and one together despite the spelling mistake.
The eye contains to kinds of receptors- rods and cones
While the rods convey shapes of gray, the cones allow the brain to perceive colours.
Of the three types of cones, the first is sensitive to red-orange light, the second to green light and the third to blue-violet light.
When a single cone is stimulated, the brain perceives the corresponding colour.
•If our green cones are stimulated, we see "green".
•If our red-orange cones are stimulated, we see "red".
•If both our green and red-orange cones are simultaneously stimulated, our perception is yellow.
Primary Colours Differs in each mode (RGB/CMYK). Colours that are seen when sunlight is shone through a prism are called the spectrum colours. These colours are;
RED,ORANGE,YELLOW,GREEN,BLUE,INDIGO,VIOLET.
Primary colours base of the RGB/additive colour system. These ROYGBIV colours are reduced to red, green, blue-violet.
Secondary ColoursThese colours are simply created from mixing 2 primary colours.
Red and yellow produce orange.
Yellow and blue produce green.
& Red and blue to produce violet.
RGB
•The eye cannot differentiate between spectral yellow, and some combination of red and green.
•The same effect accounts for our perception of cyan, magenta, and the other in-between spectral colours.
Subtractive colour and Addictive colour.
'...A subtractive color model explains the mixing of paints, dyes, inks, and natural colorants to create a full range of colors, each caused by subtracting (that is, absorbing) some wavelengths of light and reflecting the others. The color that a surface displays depends on which colors of the electromagnetic spectrum are reflected by it and therefore made visible. Subtractive color systems start with light, presumably white light. Colored inks, paints, or filters between the viewer and the light source or reflective surface subtract wavelengths from the light, giving it color. If the incident light is other than white, our visual mechanisms are able to compensate well, but not perfectly, often giving a flawed impression of the "true" color of the surface. Conversely, additive color systems start without light (black). Light sources of various wavelengths combine to make a color. In either type of system, three primary colors are combined to stimulate humans’trichromatic color vision, sensed by the three types of cone cells in the eye, giving an apparently full range' - http://en.wikipedia.org/wiki/Subtractive_color
'... a Addictive color model involves light emitted directly from a source or illuminant of some sort. The additive reproduction process usually uses red, green and blue light to produce the other colors. Combining one of these additive primary colors with another in equal amounts produces the additive secondary colors cyan, magenta, and yellow. Combining all three primary lights (colors) in equal intensities produces white. Varying the luminosity of each light (color) eventually reveals the full gamut of those three lights (colors). Computer monitors and televisions are the most common form of additive light. The colored pixels do not overlap on the screen, but when viewed from a sufficient distance, the light from the pixels diffuses to overlap on the retina. Another common use of additive light is the projected light used in theatrical lighting, such as plays, concerts, circus shows, and night clubs. Results obtained when mixing additive colors are often counterintuitive for people accustomed to the more everyday subtractive color system of pigments, dyes, inks and other substances which present color to the eye by reflection rather than emission. For example, in subtractive color systems green is a combination of yellow and blue; in additive color, red + green = yellow and no simple combination will yield green. Additive color is a result of the way the eye detects color, and is not a property of light. There is a vast difference between yellow light, with a wavelength of approximately 580 nm, and a mixture of red and green light. However, both stimulate our eyes in a similar manner, so we do not detect that difference...' - http://en.wikipedia.org/wiki/Additive_color
Tertiary colours
Tertiary colours are browns and grays and they contain all 3 primary colours.
They are created by mixing either all 3 primary colours together or a primary colour and secondary colour.
'...Tertiary colors are combinations of primary and secondary colours. There are six tertiary colors; red-orange, yellow-orange, yellow-green, blue-green, blue-violet, and red-violet. An easy way to remember these names is to place the primary name before the other colour. So the tertiary colour produced when mixing the primary colour blue with the secondary colour green, is called 'blue-green'....' -http://www.colourtherapyhealing.com/colour/tertiary_colours.php
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