To practice looping through pixels, write a program that creates a $50$ by $50$ black and white image. The image should be have a black background with a white $\text{'}$X$\text{'}$ stretching across the entire image from each of the corners. Your program should create this image and save it as 'output.png$\text{'}.$

A diagram of the expected output image is shown here:

Pixel grid

Challenge:

There are two white lines in this image, but can you find a way to draw them with only one loop?