SetPixelRgb      8901 coders/png.c                     SetPixelRgb(r,&image->background_color);
SetPixelRgb      3615 magick/image.c         SetPixelRgb(q,image->colormap+(ssize_t) index)
SetPixelRgb       595 magick/quantize.c                 SetPixelRgb(q,image->colormap+index);
SetPixelRgb      1596 magick/quantize.c           SetPixelRgb(q+u,image->colormap+index);
SetPixelRgb      1813 magick/quantize.c           SetPixelRgb(q,image->colormap+index);