Monday 29 December 2014

Basic Overview Of Advanced Color Theory

By Stacey Burt


The colour is a visual perception that is generated in brains of humans and other animals to interpret nerve signals that send the photoreceptors in retina of eye, which in turn interpreted and distinguish the different wavelengths that capture the visible part of electromagnetic spectrum (light)(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.

In other words, these cells are excited or inhibited at the higher signal intensity versus Red Green and Blue to sum of Red and Green, also generating an achromatic path information related to luminosity. The information in this processing moves through the optic nerve to lateral geniculate nucleus (located on the left and right thalamus), where neuronal activity specific regard to suggestion of colour and chiaroscuro.

In animal kingdom mammals generally do not distinguish colours well, birds however, yes; but usually have a preference for reddish colours. Insects, by contrast, tend to have a better perception of blues and even ultraviolet. Generally nocturnal animals see in black and white. Some diseases such as colour blindness or colour blindness from seeing colours well.

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.

Newton observed that when a narrow beam of sunlight incident on a triangular glass prism with an angle, a part is reflected and again passes through the glass and disintegrates in different colour bands. Newton also made to converge those same rays of colour in a second lens to form white light again. He proved that sunlight has all the colours of rainbow. When it rains and the sun shines every raindrop behaves just as Newton's prism and union of millions of raindrops phenomenon arc is formed iris.

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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