GetPixelGray     1734 magick/colorspace.c           gray=(MagickRealType) GetPixelGray(q);
GetPixelGray      512 magick/fourier.c           source_pixels[i]=QuantumScale*GetPixelGray(p);
GetPixelGray      938 magick/fourier.c           magnitude_pixels[i]=QuantumScale*GetPixelGray(p);
GetPixelGray      992 magick/fourier.c           phase_pixels[i]=QuantumScale*GetPixelGray(p);