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Text File  |  1991-08-30  |  281 b   |  14 lines
  1. {
  2.     Compute difference between luminance of two images.
  3.     Display towards red where first image is brighter,
  4.     and towards blue where second image is brighter.
  5.  
  6.     29 August 1991
  7. }
  8. l1=li(1); l2=li(2);
  9. avg=(l1+l2)/2;
  10. dif=(l1-l2)/2;
  11. ro=avg+dif;
  12. go=avg-dif*dif/2;
  13. bo=avg-dif;
  14.