Yes, one can make fine images with jpegs. However, showing them on the internet and saying that they will look great when printed large is a long tale. And there are many higher degrees of image quality than most are aware of. All images look good on the internet, from 10 year old phone pics to my 4x5 large format film scans. The internet does that. You can't tell the difference. Sending a person to a website to determine image quality is a waste of time. Only two ways to prove it. One is to actually see the final print output (not going to happen here) or someone who knows image editing pretty well can make a jpeg of a section of a very well done large file at 72 dpi (for internet) that represents the actual resolution of the bigger print file for the given area. I don't expect everyone to know all that I am talking about. I am a pro photographer and master printmaker and I do this stuff every day. It's a different world of photography than most people engage in. Don't take it personally. I only extend this conversation to inform others who may make wrong assumptions or buy into the vast array of myths and mis-information out there, and not trying to be a big mouthed know it all. But I do nearly know it all. (OK now is a good time for the trolls to rip me apart...).