InkPanther: Ah, but at what cost?
Well, as you said the image quality lessens a bit....but (imo) quality above a certain limit(where artifacts and such aren't as noticeable) is fine for a number of usages(like most "generic screenshot posting"). If I want to post a higher quality screen, I just shrink the png files a bit(length & width) to cut down on size that way, or post it to a site and then link it(as you did).
InkPanther: Still, that wouldn't do since the only reason to post was to show how nice the game was looking in HD. ;)
I hear ya
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Cavalary: The main problem with JPG tends to be text, since it blends colors at the edges and text's basically all an edge, characters being narrow, text color is clearly different from what it should be. Same for some UI elements. In actual images it's far less visible.
THIS
When I post images with text I either leave them the same size(but in jpg), or shrink them as png.....as otherwise the text becomes somewhat unreadable(ex: like the text in pic 34 of post 74 above).