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void GBitmap::binarize_grays ( int  threshold = 0  ) 

Binarizes a gray level image using a threshold. The number of gray levels is reduced to #2# as in a bilevel image. All pixels whose value was strictly greater than threshold# are set to black. All other pixels are set to white.

Definition at line 517 of file GBitmap.cpp.

References monitor().

  GMonitorLock lock(monitor());
  if (bytes)
    for (int row=0; row<nrows; row++)
        unsigned char *p = (*this)[row];
        for(unsigned char const * const pend=p+ncolumns;p<pend;++p)
          *p = (*p>threshold) ? 1 : 0;
  grays = 2;

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