CImg的使用，入门

CImg的使用：
const char *imageIN="image.jpg"
const char *imageOUT="imgeout.jpg"
CImg<uchar> input_image(imageIN);

 size_t image_width = input_image.width();
 size_t image_height = input_image.height();
 size_t channels = input_image.spectrum();  

  CImg<uchar> output_image(image_width, image_height, input_image.depth(), channels); //create

  //pout points to some data
  for(size_t h=; h<image_height; ++h)
    for (size_t w=; w<image_width; ++w) {
        output_image(w, h, , ) = *pout;     //B
        output_image(w, h, , ) = *(pout+); //G
        output_image(w, h, , ) = *(pout+); //R
        pout +=;
    }

output_image.save(imageOUT);       //save