1. Color

2. Light Spectrum
Visible light comes in different wavelengths (or frequencies).
Each wavelength represents a color.
Red (~ nm), Green(~ nm), Blue (~ nm).

3. Human Vision
The retina in human eyes has three color receptor cells, or cones.

4. RGB RGB is an additive color model. The primary colors are added to
produce new colors.

5. RGB Numeric Representation (0, 0, 0) is black (255, 255, 255) is white
(255, 0, 0) is red
(0, 255, 0) is green
(0, 0, 255) is blue
(255, 255, 0) is yellow
(0, 255, 255) is cyan
(255, 0, 255) is magenta
(255,255,0) green
(0,255,0) cyan
(0,255,255) red
Geometric Representation

6. Normalization Intensity I = (R + G + B)/3. Normalized Red
r = R/(R + G + B).
Normalized Green
g = G/(R + G + B).
Normalized Blue
b = B/(R + G + B).

7. HSI Color Model
HSI = Hue, Saturation and Intensity.

8. RGB to HSI Conversion
To find the hue angle h ∈ [0, 360]

9. HSI to RGB Conversion
HSI to RGB