In 1707, the renowned physicist Issac Newton published his treatise on optics and color theory, challenging the belief that had prevailed until those days that color was an inherent property of objects and not to light as we know it today .
Light is a form of electromagnetic energy during propagation faces various physical phenomena. One of them and of particular importance to an essentially visual world is the reflection. Reflection can be defined as the physical property of the light being bounced by the characteristics of specific molecules of objects, to continue its spread to be completely absorbed by other molecules of other different objects. That is, the objects within its molecular structure, have the ability to absorb certain wave lengths of light and reject or reflect other. At this property particles having absorption and rejection are known as pigment.
Those wavelengths of light that are reflected by the objects, reach our eyes where they are absorbed completely and interpreted by the brain as color references. White light as we know, is the sum of different wavelengths, each with a specific color, which responds to your vibration cycles. This understanding, white light is a mixture of millions of frequencies according to the ability of the human eye precepción, ranging from red to blue, through different tonalities.
When an object has a pigmented green, this is able to absorb the wavelengths of the corresponding light to all stainings, except those for the frequency defined in the spectrum of green, the latter are reflected by the object to continue its spread. Furthermore, an object that has a green pigment and is illuminated with a light beam for filtering frequency defined within the spectrum of red, will cause the object in question is displayed as black. This is because the green pigmentation, absorbs any light frequencies corresponding to red and therefore reflects nothing. In the colors determined by the light, black is the absence of the same and therefore color.
In addition to reflection, other forms of continuous propagation of light also determine the colors as dispersion. The dispersion is a special form of reflection that allows shorter light frequencies and corresponding to the blue coloring, spread by gases and particles that make up our atmosphere, thus making our sky its blue color. If we were observing the sun from a planet without atmospheric layer, we would see the contrast on a black background glare. Another way propagation is diffraction and this occurs when the surface of an object is formed by very thin and even microscopic lattices, which absorb and reflect different wavelengths of light each other wave, causing a typically visible interference in atornasolados reflexes oil or soap bubbles.
The human eye in conjunction with our brain has the amazing ability to adapt in a few seconds color references for years, he has learned and accumulated. Thus, when a “white” wall illuminated with a (typical incandescent artificial light) yellow trend, in seconds adapts to the seemingly irrational trend of color and re interprets the perception of the wall to his known reference and stored in you look memory target. Photographic film and photo digital sensors do not have the same capacity to adapt and capture the color trends as they happen. It is therefore important to always perform a white balance on our devices and not completely trust when this balance is automatically performed as part of the programming team.