Editing RGB color model (section)

==Geometric representation==
{{See also|RGB color spaces}}
[[File:RGB color solid cube.png|thumb|The RGB color model mapped to a cube. The horizontal x-axis as red values increasing to the left, y-axis as blue increasing to the lower right and the vertical z-axis as green increasing towards the top. The origin, black is the vertex hidden from view.]]

Since colors are usually defined by three components, not only in the RGB model, but also in other color models such as [[Lab color space|CIELAB]] and [[Y'UV]], among others, then a [[Three-dimensional space|three-dimensional]] [[volume]] is described by treating the component values as ordinary [[Cartesian coordinate system|Cartesian coordinates]] in a [[Euclidean space]]. For the RGB model, this is represented by a cube using non-negative values within a 0–1 range, assigning black to the origin at the vertex (0,&nbsp;0,&nbsp;0), and with increasing intensity values running along the three axes up to white at the vertex (1,&nbsp;1,&nbsp;1), diagonally opposite black.

An RGB triplet (''r'',''g'',''b'') represents the three-dimensional coordinate of the point of the given color within the cube or its faces or along its edges. This approach allows computations of the [[Color difference|color similarity]] of two given RGB colors by simply calculating the [[euclidean distance|distance]] between them: the shorter the distance, the higher the similarity. Out-of-gamut computations can also be performed this way.