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Color balance
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===Scaling camera RGB=== By Viggiano's measure, and using his model of gaussian camera spectral sensitivities, most camera RGB spaces performed better than either monitor RGB or XYZ.<ref name="Viggiano2004"/> If the camera's raw RGB values are known, one may use the 3x3 diagonal matrix: : <math>\left[\begin{array}{c} R \\ G \\ B \end{array}\right]=\left[\begin{array}{ccc}255/R'_w & 0 & 0 \\ 0 & 255/G'_w & 0 \\ 0 & 0 & 255/B'_w\end{array}\right]\left[\begin{array}{c}R' \\ G' \\ B' \end{array}\right]</math> and then convert to a working RGB space such as [[sRGB]] or [[Adobe RGB]] after balancing. <!-- in progress! However, if one has already converted to monitor RGB, one may still work in camera RGB if a 3x3 [[regular matrix]] <math>\mathbf{A}</math> characterizes the camera's color mixing behavior reasonably well, so that: : <math>\left[\begin{array}{c} X \\ Y \\ Z \end{array}\right]\approx\mathbf{A}\left[\begin{array}{c}L_R \\ L_G \\ L_B \end{array}\right]</math> (This matrix is included in the [[ICC profile]] for some cameras.<ref name="ICC01_2006">International Color Consortium, ''Specification ICC.1:2004-10 (Profile version 4.2.0.0) Image technology colour management β Architecture, profile format, and data structure'', (2006).</ref>) If this matrix is known, one computes: :<math>\left[\begin{array}{c} L_R \\ L_G \\ L_B \end{array}\right]=\mathbf{P^{-1}A^{-1}}\left[\begin{array}{ccc}R_w/R'_w & 0 & 0 \\ 0 & G_w/G'_w & 0 \\ 0 & 0 & B_w/B'_w\end{array}\right]\mathbf{A\cdotP}\left[\begin{array}{c}L_{R'} \\ L_{G'} \\ L_{B'} \end{array}\right]</math> where <math>\mathbf{P}</math> is the phosphor matrix mentioned in the previous section; <math>L_{Rw}</math, <math>G_w</math, <math>B_w</math are the -->
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