I assume it's because the image follows very specific patterns that the PNG algorithm is able to compress it so much? Each individual square has a set green val

I assume it's because the image follows very specific patterns that the PNG algorithm is able to compress it so much? Each individual square has a set green value, the pixel to the right is red + 1, and the pixel below is blue + 1. I was trying to figure out how it's possible to store 16 million separate colors in 58,000 bytes. Looks like it's storing information about the gradient patterns, and not each individual color.