title: How to output all color of each pixel of an image in hexadecimal color (6digit)
body: <p>How can i print all the color in image using C++ in hexadecimal code such as (#FFFFFF) ?
  What kind of library that i need in  order to extract all the color pixel by pixel? and how to code to loop to all pixel one by one code using that library?
  Sorry my bad english.
  Thanks.</p>