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Digital photography defines an image as an array of dots called pixels that have a defined color.

The color is based on combinations of the red, blue and green components (RBG = Red, Blue, Green).

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Description

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Photographic images store colors in pixels that contain the three primary colors (red-green-blue). This encoding is called RGB (Red-Green-Blue), and each of the three numbers ranges from 0 to 255.

There is a non-unique relationship between RGB encoding and the different frequencies of light. Through this relationship, it's possible to determine the frequency of light for each pixel in a photo.

Definition of CIE 1931:

http://en.wikipedia.org/wiki/CIE_1931_color_space

Example of Application:

https://rip94550.wordpress.com/2010/03/08/color-from-xyz-to-spectrum/

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