/[gzz]/manuscripts/Paper/paper.tex
ViewVC logotype

Diff of /manuscripts/Paper/paper.tex

Parent Directory Parent Directory | Revision Log Revision Log | View Patch Patch

revision 1.89 by tjl, Mon Mar 31 13:35:21 2003 UTC revision 1.90 by tjl, Mon Mar 31 13:44:31 2003 UTC
# Line 808  and Linux drivers emerge. Line 808  and Linux drivers emerge.
808  Color is the most dominant visual attribute of a texture.  Color is the most dominant visual attribute of a texture.
809  Therefore, it is essential that the overall colors of the  Therefore, it is essential that the overall colors of the
810  backgrounds are maximally diverse with respect to color perception.  backgrounds are maximally diverse with respect to color perception.
811  However, we come again to the entropy arguments  However, we come again to the number-of-different-features arguments
812  of Section~\ref{secfeaturevec}:  of Section~\ref{secfeaturevec}:
813  too many different colors in one background are perceived just  too many different colors in a {\em single} background are perceived just
814  as a mix of many colors, making all such backgrounds look the same.  as a mix of many colors, making all such backgrounds look the same.
815    
816  To maintain color balance,  To maintain recognizability,
817  we use a heuristically selected  we use a
818  small palette of colors for each paper.  small palette of colors for each paper, selected
819    randomly from a heuristic distribution.
820  The final image contains convex combinations of  The final image contains convex combinations of
821  the palette colors.  the palette colors.
822    
# Line 824  is fairly perceptually uniform, it is no Line 825  is fairly perceptually uniform, it is no
825  random colors (cf. \cite{healey96choosing}):  random colors (cf. \cite{healey96choosing}):
826  using a uniformly chosen hue angle  using a uniformly chosen hue angle
827  produces too much blue and too little yellow  produces too much blue and too little yellow
828  for high $L^*$.  for high $L^*$ (luminance).
829  Because of this, we use a different color circle  Because of this, we use a different color circle
830  with seven evenly spaced ``primary'' hues (RGB, CMY and orange).  with seven evenly spaced ``primary'' hues (RGB, CMY and orange).
831  %  %
# Line 879  saturated colors: unsaturated colors can Line 880  saturated colors: unsaturated colors can
880  palette because the adaptive effects of the eye shift them  palette because the adaptive effects of the eye shift them
881  towards the complementary colors of the more saturated colors  towards the complementary colors of the more saturated colors
882  in the palette.  in the palette.
883    
884  %  %
885  %Usually, only a maximum circle  %Usually, only a maximum circle
886  %contained in the gamut of a given lightness level is used for  %contained in the gamut of a given lightness level is used for
# Line 913  in PC systems. Line 915  in PC systems.
915  %Note that for correct computation of the lightness,  %Note that for correct computation of the lightness,
916  %it is essential that the display gamma is properly adjusted  %it is essential that the display gamma is properly adjusted
917  %for linear (XXX: usually around gamma 2) RGB reproduction.  %for linear (XXX: usually around gamma 2) RGB reproduction.
   
918  For each background,  For each background,
919  we use colors from {\em both} the dark and light end of the  we use colors from {\em both} the dark and light end of the
920  80-100 range in order to create some contrast.  80-100 range in order to create some contrast.

Legend:
Removed from v.1.89  
changed lines
  Added in v.1.90

savannah-hackers-public@gnu.org
ViewVC Help
Powered by ViewVC 1.1.26