color1-11may10-150dpi-med

color1-11may10-150dpi-med - Color I: trichromatic theory CS...

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Color I: trichromatic theory Marc Levoy Computer Science Department Stanford University CS 178, Spring 2010
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! Marc Levoy Outline ! spectral power distributions ! color response in animals and humans ! 3D colorspace of the human visual system and color Flter arrays in cameras ! reproducing colors using three primaries ! additive versus subtractive color mixing ! cylindrical color systems used by artists (and Photoshop) ! chromaticity diagrams color temperature and white balancing standardized color spaces and gamut mapping 2
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! Marc Levoy Newton’s Experimentum Crucis ! sunlight can be divided into colors using a prism ! these colors cannot be further divided using a 2nd prism ! experiment performed 1665, drawing made in 1672 3 Isaac Newton (1643-1727) (Robin)
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! Marc Levoy Newton’s Experimentum Crucis ! alternatively, the divided colors can be recombined using a lens and 2nd prism into a new beam that has exactly the same properties as the original 4 Isaac Newton (1643-1727) (Robin)
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! Marc Levoy The visible light spectrum ! wavelengths between 400nm and 700 nm (0.4μ - 0.7μ) ! exactly the colors in a rainbow 5 (wikipedia)
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! Marc Levoy The visible light spectrum ! wavelengths between 400nm and 700 nm (0.4μ - 0.7μ) ! exactly the colors in a rainbow 6 (Dan Bush)
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! Marc Levoy Spectral power distribution (SPD) ! units of power are watts (joules per second) ! shown here are spectra of common illumination sources ! plots above are relative amounts (%) of each wavelength 7 (LampTech)
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! Marc Levoy Interaction of light with matter ! spectrum of illumination is multiplied wavelength-by- wavelength by reFectance spectrum of object cause is absorption by the material so the spectrum you see depends on the illumination! ! transmittance operates the same way 8 ! = illumination reFectance stimulus that enters your eye light is reFected by an object
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! Marc Levoy Examples of reFectance spectra ! two different spectra may appear alike to us white petal and white Fower (above left) these are called metamers ! Newton observed this, but could not explain it 9 (http://www.cs.brown.edu/exploratories/freeSoftware/repository/edu/ brown/cs/exploratories/applets/spectrum/metamers_java_browser.html)
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! Marc Levoy Outline ! spectral power distributions ! color response in animals and humans ! 3D colorspace of the human visual system and color Flter arrays in cameras ! reproducing colors using three primaries ! additive versus subtractive color mixing ! cylindrical color systems used by artists (and Photoshop) ! chromaticity diagrams color temperature and white balancing standardized color spaces and gamut mapping 10
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! Marc Levoy 1. organisms having only one kind of retinal receptor cannot distinguish changes in intensity from changes in wavelength, hence they have no color discrimination - for example a unit amount of ! 1
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This document was uploaded on 12/06/2011.

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color1-11may10-150dpi-med - Color I: trichromatic theory CS...

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