Photographic Composition – Colors

Photographic Composition – Colors

In 1676 Newton demonstrated (empirically) how white light was composed of seven basic colors (red, orange, yellow, green, blue, indigo, purple). And it was thanks to this discovery that the true color was opened with the discovery of other important principles such as that of complementary colors in the color scale there are colors that, if added, give white as a result colors. Finding the complementary color is also quite easy given a color, its complement is the resultant of the sum of all the other colors. If for example our color is green, adding the other 6 colors we will find it with red. Red and green are complementary and in fact, if added, they give the white.

What is the color Color is a phenomenon related to the ability of the human eye to perceive the different wavelengths, that is, of radiation smiles multimedia. At each wavelength our brain associates a different color. Of course not all wavelengths are perceived by our eye we can only see the lengths between 380 nm and 780 nm. In this range, our brain associates colors ranging from purple to red. Below and above there are obviously other wavelengths that are invisible to our eyes (such as radiation from cell phones, WiFi routers, satellites, and so on).

The visible wavelengths are also called color space. The color space is shown in a chromatic diagram or CIE 1931 chromatic diagram

In the color chart are all the colors that can be generated and lie within the rectangular triangle colored in black. Within this triangle, the CIE plot of real colors is plotted. This diagram has the shape of a bell and encloses all the possible colors that the human eye can see. Outside the bell (but always within the triangle) there are all colors that are not visible (or can not be distinguished from our eye). The CIE diagram enjoys, for the way it was generated, some important features

At the center of the CIE diagram there is a strategic point C. It is the so-called Illuminant CIE, taken as a reference and corresponding to the radiation emitted by a white surface illuminated by mean daylight.
Along the curved perimeter of the bell are all the spectral shades to their full saturation.
At the top of the diagram there are the families of the greens; Bottom left blue, bottom right reds.

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