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Comparing ray/src/px/pcond.h (file contents):
Revision 3.3 by greg, Fri Oct 11 10:46:59 1996 UTC vs.
Revision 3.4 by greg, Thu Jan 9 13:56:26 1997 UTC

# Line 65 | Line 65 | extern short   fvxr, fvyr;             /* foveal image resolution *
65  
66   #define fovscan(y)      (fovimg+(y)*fvxr)
67  
68 < extern int      bwhist[HISTRES];        /* luminance histogram */
69 < extern long     histot;                 /* total count of histogram */
68 > extern float    bwhist[HISTRES];        /* luminance histogram */
69 > extern double   histot;                 /* total count of histogram */
70   extern double   bwmin, bwmax;           /* histogram limits */
71   extern double   bwavg;                  /* mean brightness */
72  
73 < #define bwhc(B)         bwhist[(int)(HISTRES*((B)-bwmin)/(bwmax-bwmin))]
73 > #define bwhi(B)         (int)(HISTRES*((B)-bwmin)/(bwmax-bwmin))
74  
75   extern RGBPRIMP inprims;                /* input primaries */
76   extern COLORMAT inrgb2xyz;              /* convert input RGB to XYZ */

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