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revision 1.194 by tjl, Sun Dec 1 20:44:35 2002 UTC revision 1.195 by tjl, Sun Dec 1 20:52:49 2002 UTC
# Line 571  the palette colors. Line 571  the palette colors.
571    
572  Even though the CIE $L^*a^*b^*$ \cite{cie86colorimetry} color space  Even though the CIE $L^*a^*b^*$ \cite{cie86colorimetry} color space
573  is fairly perceptually uniform, it is not good for selecting  is fairly perceptually uniform, it is not good for selecting
574  single, random colors:  random colors:
575  using a uniformly chosen hue angle  using a uniformly chosen hue angle
576  produces too much blue and too little yellow  produces too much blue and too little yellow
577  for high $L^*$.  for high $L^*$.
# Line 603  with seven evenly spaced ``primary'' hue Line 603  with seven evenly spaced ``primary'' hue
603  %For example, the CIE $L^*a^*b^*$ \cite{cie86colorimetry}  %For example, the CIE $L^*a^*b^*$ \cite{cie86colorimetry}
604  %color space is reasonably perceptually uniform.  %color space is reasonably perceptually uniform.
605    
606  To produce chromatically compatible colors, we choose  Hues are chosen from a distribution which usually clusters
607  the hue angles for the base colors of a single background  them fairly close together but also allows far-away hues
608  from a distribution  in the same palette occasionally.
 concentrated  
 on one random hue with a random variance  
 (hyperparameters).  
 This produces related colors with high probability, but still  
 allows motley palettes to occur occasionally.  
 Opposite color schemes could also be used for more variation,  
 but because the combiners can produce any color in the convex hull  
 of the palette, the interpolated colors would easily span too  
 much area on the color circle.  
609  The saturations are chosen by an ad hoc distribution.  The saturations are chosen by an ad hoc distribution.
610    
611    % To produce a palette of
612    % chromatically compatible colors, we choose
613    % the hue angles for the base colors of a single background
614    % from a distribution
615    % concentrated
616    % on one random hue with a random variance
617    % (hyperparameters).
618    % This produces related colors with high probability, but still
619    % allows motley palettes to occur occasionally.
620    
621    % Opposite color schemes could also be used for more variation,
622    % but because the combiners can produce any color in the convex hull
623    % of the palette, the interpolated colors would easily span too
624    % much area on the color circle.
625    
626  % Uniform?  % Uniform?
627  %  1) define term  %  1) define term
628  %  2) not really uniform; it's MORE uniform than RGB but not  %  2) not really uniform; it's MORE uniform than RGB but not

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