This is an odd question to ask but this has been bugging me for years. Sometimes I'll find a picture, or even a video of portal 1 where the portals look like this

I know it's blurry and stuffty but I couldn't find a video and it still gives you an idea of what I'm talking about. IMO these portals look a lot better then whats in the game but the games portals look nothing like that. And this isn't the only screenshot I've seen, like I've said I've seen gameplay videos where it looks like that too. Does anyone have any idea why some videos of portal have them look like that? Is it a graphics mod because I can't find one like that, was it some pre alpha design that was only shown in dev videos? I need to know.