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root/radiance/ray/src/px/panim.c
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Comparing ray/src/px/panim.c (file contents):
Revision 1.6 by greg, Thu Apr 5 13:58:45 1990 UTC vs.
Revision 2.1 by greg, Tue Nov 12 16:05:34 1991 UTC

# Line 103 | Line 103 | char   *file;
103          }
104                                                  /* get dimensions */
105          getheader(fp, NULL);
106 +        if (checkheader(fp, COLRFMT, NULL) < 0) {
107 +                fputs(file, stderr);
108 +                fputs(": not a Radiance picture\n", stderr);
109 +                exit(1);
110 +        }
111          if (fgetresolu(&xres, &yres, fp) != (YMAJOR|YDECR) ||
112                          xres > SCANLINE || yres > NUMSCANS) {
113                  fputs(file, stderr);
# Line 144 | Line 149 | compgamma()                            /* compute gamma correction map */
149          register int  i, val;
150  
151          for (i = 0; i < 256; i++) {
152 <                val = pow(i/256.0, 1.0/GAMMA) * 256.0;
152 >                val = pow((i+0.5)/256.0, 1.0/GAMMA) * 256.0;
153                  if (val > 248) val = 248;
154                  gammamap[i] = val;
155          }

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