There’s enough technology involved in rendering this thing that some artifacts do, for most practical purposes, “just magically appear”. When you repeatedly process one document thru inconsistent iterations of scanning, filtering, compressing, decomposing, rendering, etc. involving decades of variously limited technologies, some weird stuff starts becoming apparent.
Try this: screenshot this page, paste it into Paint, save as .GIF, load it, resize it, save it as .JPG, load it into Photoshop, posterize it, rescale it, save it as a high-compression .JPG, load it, ... you get the idea ... then show us the results. You’ll end up with a pretty weird-looking copy of the original, probably with some pronounced flare and halos.
I just did that (sorry, can’t post the results at the moment). Result was very similar “halo” artifacts.
You conspiraists haven’t actually tried this stuff, have you?
Okay, lets say they did these format changes. And, the reason they did all this to Obama's BC is? Are you familiar with the Latin term "lex parsimoniae"?