12/21/2014

Guide To Advanced Color Theory

By Stacey Burt


This accurate information is transferred to visual cortex in ways called optical radiation. Colour perception is a result of activity of complex neurons of visual cortex area V4 / V8, specific to colour. This activity determines that the experiential qualities of colour vision may be referred by the attributes: brightness, hue and saturation (advanced color theory).

The reflected waves are captured by the eye and interpreted in brain as different colours depending on the lengths of corresponding waves. The human eye can only perceive wavelengths when light is abundant. In low light is in black and white. In so-called additive synthesis (commonly called "colour overlay light") white colour results from the superposition of all colours, while black is the absence of colour.

When this light encounters a pigment, some waves are absorbed by chemical bonds and substituents of pigment, while others are reflected. This new spectrum of reflected light creates the appearance of colour. For example, a dark blue pigment reflects blue light, and absorbs other colours.

The appearance of pigments or dyes is closely linked to the light they receive. Sunlight has a high colour temperature and a relatively uniform spectrum, and is considered a standard for white light. Artificial light, meanwhile, tends to have large variations in parts of its range. Seen inse terms, pigments or dyes of different colours look. The dyes used for colouring materials such as fabric, while the pigments used to cover a surface, such as a box. From glaciations human employing plants and animal parts for natural dyes with which coloured their tissues. Then the painters have prepared their own pigments.

The first to intervene are photoreceptors, which capture the light that strikes them. They are of two types: rods and cones. Other retinal cells are responsible for transforming said light into electrochemical impulses and transport them to optic nerve. From there, projecting the brain. In brain process of forming the colours and rebuild the distances, movements and shapes of observed objects is performed.

This region, called visible spectrum, includes wavelengths from 380 nm to 780 nm (1 nm = 1 nanometer = 0.000001 mm). The light from each ofse wavelengths is seen in human brain as a different colour. Therefore, in decomposition of white light in all wavelengths by a prism or rain in rainbow, the brain perceives all colours. Therefore, the visible spectrum, which is the part of electromagnetic spectrum of sunlight can be seen, each wavelength is perceived in brain as a different colour. Newton first used the word spectrum (Latin for "appearance" or "apparition") in 1671 in describing his experiments in optics.

A normal human eye has only three types of receptors, called cones. They respond to specific wavelengths of red, green and blue light.

When light strikes an object, its surface absorbs certain wavelengths and reflect others. Only reflected wavelengths can be seen by the eye and therefore in brain only those colours are perceived. It is a different natural light process that has all wavelengths, there whole process only has to do with light, now in colours we perceive an object also the object must be taken into account if that sleeps to absorb certain wavelengths and reflect others.




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