We have a special function show_img() for this lab. It is the “D‐to‐C” converter for images. This function handles the scaling of the image values and allows you to open up multiple image display windows. All image values must be non‐negative for the purposes of display. The default format for most gray scale displays is eight bits, so the pixel values x[m, n] in the image are integers in the range 0 ≤ x[m,n] ≤ 255