color. light spectrum visible light comes in different wavelengths (or frequencies). each wavelength...
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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
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