message: Change program type in hdr format files to modern value: RADIANCE so
  modern readers that expect RADIANCE will read it
diff: @@ -145,7 +145,7 @@ rgbe2float(float *red, float *green, float *blue, unsigned char rgbe[4])
  /* default minimal header. modify if you want more information in header */
  int RGBE_WriteHeader(FILE *fp, int width, int height, rgbe_header_info *info)
  {
  - const char *programtype = "RGBE";
  + const char *programtype = "RADIANCE";
  if (info && (info->valid & RGBE_VALID_PROGRAMTYPE))
  programtype = info->programtype;
  