There are several images in this thread. Not sure which you are referring to. I think most of them are 640x480 which is a common size for forum particularly for a thread that is ten years old. Have you tried an image search? Here are a couple of searches
https://duckduckgo.com/?t=ffab&q=ham...ges&iax=images which has the resolution in the lower left of the image and
https://www.google.com/search?num=50...8Q0pQJegQIDRAB
I'm curious as to why you want a higher resolution.