How can I duplicate this type of image? I'm very new to the idea of signal processing, could someone point me in the direction of of a program to toy with images, below is a link to 2 taken a split second apart that showed up on my Amazon app. I've been making decimated images recently in Photoshop and want to play with images in a way that may have more effect like this





The second image is sort of pixelated but not totally decimated image of the first image, an almost plain book cover. It's a split second of the lower one of this pixelation  then snaps into the regular image. How can I take original images and process them with different signals to this effect. Notice there's banding on the top and bottom so it's not just a simple rescaling in Photoshop which I'm very familiar with.
I just cropped the original gray image:



and converted it to JPEG using irfanview, settings to 15% (my first guess, good feeling isn't?):



You can see see the same yellowish shades on the right, due to heavy chroma quantization. Specifying that the image should remain grayscale gives you this: