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  d ,  :$0e?0e?5%?Rectangle 3 0  d .Subtractive color mixing When colors combine by multiplying the color spectra. Examples that follow this mixing rule: most photographic films, paint, cascaded optical filters, crayons. cyan yellow Cyan and yellow (in crayons, called  blue and yellow) make& www.sliderbase.com   """  3380 _PPT10.3_uwd 0(  02 0 N  NlP?Rectangle 7_   QFoundations of Vision, by Brian Wandell, Sinauer Assoc., 1995 www.sliderbase.com R( RR "    r0e?0e??Rectangle 2   d    jP0e?0e?5%?Rectangle 3 0  d QFoundations of Vision, by Brian Wandell, Sinauer Assoc., 1995 www.sliderbase.com R RQ """  3380 _PPT10.3 L` (wd g _ G (    NmP?Rectangle 7_   \Grassman s Laws For color matches: symmetry: U=V V=U transitivity: U=V and V=W => U=W proportionality: U=V tU=tV additivity: if any two (or more) of the statements U=V, W=X, (U+W)=(V+X) are true, then so is the third These statements are as true as any biological law. They mean that additive color matching is linear. Forsyth & Ponce www.sliderbase.com (  "    r0e?0e??Rectangle 2   db   jP0e?0e?5%?Rectangle 3 0  d fGrassman s Laws For color matches: symmetry: U=V V=U transitivity: U=V and V=W => U=W proportionality: U=V tU=tV additivity: if any two (or more) of the statements U=V, W=X, (U+W)=(V+X) are true, then so is the third These statements are as true as any biological law. They mean that additive color matching is linear. Forsyth & Ponce www.sliderbase.com   """  3380 _PPT10.3 L` )wd / '  (    N@nP?Rectangle 7_   @Measure color by color-matching paradigm Pick a set of 3 primary color lights. Find the amounts of each primary, e1, e2, e3, needed to match some spectral signal, t. Those amounts, e1, e2, e3, describe the color of t. If you have some other spectral signal, s, and s matches t perceptually, then e1, e2, e3 will also match s, by Grassman s laws. Why this is useful it lets us: Predict the color of a new spectral signal Translate to representations using ot

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