Color.

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Presentation transcript:

Color

Light Spectrum Visible light comes in different wavelengths (or frequencies). Each wavelength represents a color. Red (~700-630nm), Green(~560-490nm), Blue (~490-450nm).

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

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

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

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).

HSI Color Model HSI = Hue, Saturation and Intensity.

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

HSI to RGB Conversion HSI to RGB