lecture13-2

are hsv color model hue h is the angle hue around

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Unformatted text preview: lluminating the object?) are HSV Color Model Hue (H) is the angle Hue around the vertical axis around Saturation (S) is a value from 0 to 1 indicating how far from the vertical axis the color lies Value (V) is the height of Value the hexcone” the HSV Color Model H 0 120 240 * * * 60 270 270 S 1.0 1.0 1.0 0.0 0.0 * 1.0 0.5 0.0 V 1.0 1.0 1.0 1.0 0.5 0.0 1.0 1.0 0.7 Figure 15.16&15.17 from H&B Color Red Green Blue White Gray Black ? ? ? Intuitive Color Spaces A top-down view of hexcone HSV Color Space A more intuitive color space • H = Hue • S = Saturation • V = Value (or brightness) Hue Saturation Value Precise Color Specifications • Pigment-mixing is subjective --- depends on human observer, Pigment-mixing surrounding colors, lighting of the environment, etc surrounding • We need an objective color specification • Light is electromagnetic energy in the 400 to 700 nm wavelength Light range range • Dominant wavelength is the wavelength of the color we “see” • Excitation purity is the proportion of pure colored light to white light • Luminance is the amount (or intensity) of the light is Electromagnetic Spectrum Visible light frequencies range between ... 14 • Red = 4.3 x 1014 hertz (700nm) hertz 14 • Violet = 7.5 x 1014 hertz (400nm) hertz Figures 15.1 from H&B Visible Light Hue = dominant frequency (highest peak) Saturation = excitation purity (ratio of highest to rest) Lightness = luminance (area under curve) White Light Figures 15.3-4 from H&B Orang...
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This note was uploaded on 01/23/2012 for the course CS 445 taught by Professor Bloomfield,a during the Spring '08 term at UVA.

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