# 3D Color Cube
The 3D Color Cube visualises the colour distribution of the signal in a three-dimensional space. Each pixel is plotted as a point in the selected colour model, revealing clusters, gaps, and colour casts that are hard to spot in 2D scopes.
3D Color Cube in RGB mode
## Color Models
| Model | Description |
| ----------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| **RGB** | Red / Green / Blue axes forming a unit cube — the native colour space of the signal |
| **CIE XYZ** | CIE 1931 tristimulus colour space — `Y` is photometric luminance, `X` and `Z` are the other two matching-function outputs. Signal is converted from RGB to XYZ via the active colour space's matrix. |
| **CIE Lab** | Perceptually-uniform `L*a*b*` space derived from XYZ and a reference white (usually D65). `L*` is perceptual lightness; `a*` and `b*` encode the two chromatic opponent axes (red/green, yellow/blue). Unlike RGB or XYZ, equal distances in Lab correspond roughly to equal perceptual differences — which is why ΔE is computed there. |
| **CHL** | Chroma / Hue / Lightness cylindrical projection derived from Lab — same perceptual data, just in polar form |
| **HSV** | Hue / Saturation / Value cylindrical projection of RGB — convenient for content editing but not perceptually uniform |
