Lecture12-Color

Lecture12-Color - CS 455 – Computer Graphics Color What...

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Unformatted text preview: CS 455 – Computer Graphics Color What is Color? • Color is the spectra of light being perceived by some the human visual system • Light is electromagnetic energy in the 400 to 700 nm wavelength range of the electromagnetic spectrum Direct: light reaching the eye (or sensor) Reflected: light that bounces • Why discuss color? Many ways to talk about color: tint, shade, hue, brightness, luminance, color, chromaticity, … Useful to understand how the eye perceives color Need to know how light/color interact with objects in order to render them realistically Electromagnetic Energy Spectrum Ultraviolet Violet Blue Cyan Green Yellow Orange Red Infrared 400 500 600 700 nm 200 400 600 800 Relative Energy Wavelength Sun Tungsten lamp Candle flame Human Visual System • Photoreceptor cells – rods, cones • Rods On the periphery For dark vision Good for seeing motion • Cones In the middle Concentrated at the fovea Good for color Human Visual System...
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This note was uploaded on 03/02/2012 for the course C S 455 taught by Professor Jones,m during the Winter '08 term at BYU.

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Lecture12-Color - CS 455 – Computer Graphics Color What...

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