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root/radiance/ray/src/cal/cal/picdiff.cal
Revision: 1.2
Committed: Wed Nov 30 21:26:39 2011 UTC (12 years, 4 months ago) by greg
Branch: MAIN
CVS Tags: rad5R4, rad5R2, rad4R2P2, rad5R0, rad5R1, rad4R2, rad4R2P1, rad5R3, HEAD
Changes since 1.1: +3 -1 lines
Log Message:
Added check for negative green channel

File Contents

# Content
1 { RCSid $Id$ }
2 {
3 Compute difference between luminance of two images.
4 Display towards red where first image is brighter,
5 and towards blue where second image is brighter.
6
7 29 August 1991
8 }
9 l1=li(1); l2=li(2);
10 pos(x):if(x,x,0);
11 avg=(l1+l2)/2;
12 dif=(l1-l2)/2;
13 ro=avg+dif;
14 go=pos(avg-dif*dif/2);
15 bo=avg-dif;