13_Color - Color Color and and Color Model Color Model...

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Unformatted text preview: Color Color and and Color Model Color Model Chap. 12 Color Color Visibility Visibility n Interpretation of color is a psychophysiology problem – We could not fully understand the mechanism – Physical characteristics of color can be represented by a formal expression presentation by experimental results n The concept of color – Spectrum of color : discovered in 1666 by Newton Newton’s prism decomposition Physics of Light Physics of Light n Electromagnetic spectrum: n Visible spectrum : red (750 nm ) ~ violet (380 nm ) Physics of Light Physics of Light Some examples of the reflectance spectra of surfaces Wavelength (nm) % Photons Reflected Red 400 700 Yellow 400 700 Blue 400 700 Purple 400 700 dominant wavelength (or dominant frequency ) Psychological Characteristics of Color Psychological Characteristics of Color Mean Hue yellow green blue # Photons Wavelength Hue : indicates a characteristic related to the dominant wavelength in a mixed light wave, and represents a dominant color as perceived by a human observer B. Area Lightness bright dark Area Brightness # Photons Wavelength © Stephen E. Palmer, 2002 © Stephen E. Palmer, 2002 n Luminance – the measured amount of energy perceived by an observer (Lumens) – the physical measure of brightness. Psychological Characteristics of Color Psychological Characteristics of Color Variance Saturation Wavelength high medium low hi. med. low # Photons © Stephen E. Palmer, 2002 Psychological Characteristics of Color Psychological Characteristics of Color n Saturation (purity) Ø How close a light appear to be to a pure spectral color Ø how much a color is NOT mixed with the white light Chromacity : hue + saturation Intensity & Brightness Intensity & Brightness 100 200 300 400 500 600 700nm Spectrum intensity 200 400 400 500 300 600 400 600 600 100 400 700 300 700 300 4 3 2 1 § intensity : the amount of light, or the amount of a particular color actually reflected or transmitted from a physical object....
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13_Color - Color Color and and Color Model Color Model...

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