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revision 1.21 by jvk, Thu Mar 13 13:40:57 2003 UTC revision 1.22 by jvk, Fri Mar 14 10:49:55 2003 UTC
# Line 709  the palette colors. Line 709  the palette colors.
709    
710  Even though the CIE $L^*a^*b^*$ \cite{cie86colorimetry} color space  Even though the CIE $L^*a^*b^*$ \cite{cie86colorimetry} color space
711  is fairly perceptually uniform, it is not good for selecting  is fairly perceptually uniform, it is not good for selecting
712  random colors:  random colors (cf. \cite{healey96choosing}):
713  using a uniformly chosen hue angle  using a uniformly chosen hue angle
714  produces too much blue and too little yellow  produces too much blue and too little yellow
715  for high $L^*$.  for high $L^*$.
716  Because of this, we use a different color circle  Because of this, we use a different color circle
717  with seven evenly spaced ``primary'' hues (RGB, CMY and orange).  with seven evenly spaced ``primary'' hues (RGB, CMY and orange).
718  %  %
719  Studies of color distance, linear separation, and color category  % healey96choosing:
720  \cite{healey96choosing} have also yielded similarly biased hue spacing  % Studies of color distance, linear separation, and color category
721  for maximised discriminability.  % - notes regarding color naming study result table:
722  XXX  %      - orange is clearly perceived as a distinct color
723    %      - a large range of hues is perceived as blue
724    %      - many different names for hues of magenta (pink, purple, magenta)
725    % - a maximum of seven colors seems to be easily discriminable;
726    % - the 7 colors reached by maximising discriminability are in fact
727    %   very close to our RGB, CMY, orange colors
728    
729    
730  % To balance the blue bias, we use seven primaries  % To balance the blue bias, we use seven primaries
731  % with orange added between the usual hues  % with orange added between the usual hues

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