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revision 1.191 by jvk, Sun Dec 1 20:35:45 2002 UTC revision 1.192 by tjl, Sun Dec 1 20:40:34 2002 UTC
# Line 573  Usually color perception is divided to l Line 573  Usually color perception is divided to l
573  and saturation (the chromatic purity), which are nonlinearly  and saturation (the chromatic purity), which are nonlinearly
574  related to the usual RGB values.  related to the usual RGB values.
575    
576  There is one problem in using the hue angles  Even though the CIE $L^*a^*b^*$ \cite{cie86colorimetry} color space
577  of the CIE $L^*a^*b^*$ \cite{cie86colorimetry} color space ---  is fairly perceptually uniform, it is not good for selecting
578  it produces too much blue and too little yellow in  single, random colors:
579    using a uniformly chosen hue angle
580    produces too much blue and too little yellow in
581  the range of light colors.  the range of light colors.
582  Therefore, we actually map the angles to hues  Because of this, we map use a different color circle
583  using a color circle with  with seven evenly spaced ``primary'' hues (RGB, CMY and orange).
584  evenly spaced ``primary'' hues.  % To balance the blue bias, we use seven primaries
585  To balance the blue bias, we use seven primaries  % with orange added between the usual hues
586  with orange added between the usual hues  % of the six saturated corners of the RGB cube.
 of the six saturated corners of the RGB cube.  
587    
588  %In addition to choosing perceptually diverse colors,  %In addition to choosing perceptually diverse colors,
589  %there is the the question of how many colors to use.  %there is the the question of how many colors to use.
# Line 1015  OTHER IDENTITY: EDGE SHAPE Line 1016  OTHER IDENTITY: EDGE SHAPE
1016    
1017  NONREP: BAD HW ACCEL?  NONREP: BAD HW ACCEL?
1018    
1019    COLORS MOST DIFFICULT
1020    
1021  % \section{MPEG Animation}  % \section{MPEG Animation}
1022  % [not to be included in final ms.]  % [not to be included in final ms.]

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