Has anyone ever dared to try it? I would suggest that you do not unless you are running a really good computer. Heres what it does:
When you push Shift and F2 while playing minecraft, your game will seem to hang, and look like its spinning around. What it is actually doing is taking a super huge screenshot of minecraft. And when I say huge do I mean huge. About 1.8 GB Huge. The game (if it survives) will let you know that it has taken a screenshot, and you will find it in your screenshots folder. The file will be about 1.8Gb big, in a TGA format. The issue with this is, is that virtually no picture viewing program will open it. Photoshop will fail, all windows based picture editor/viewers will fail, and even more powerful viewers like IrfanView will fail too without some modifications. IrfanView will work, but you will need a program like CFF viewer to modify it to use more than 2Gb of memory. Of course the easy way is to just use GIMP. GIMP will open it, after about a 5-10 minute wait to let it process.
So what does this do? Well its a feature of minecraft that has not been finished. It has been stated by Notch in various Reddit posts (I had them open, but lost them. I might be able to find them again for a 100% accurate reference) that the feature was for taking massive scale pictures, to be used for wall prints. Basically Notch wanted to take screenshots so big, he could print the fuckers out and put them on to a fucking billboard. That big. Realistically, he just wanted some very large images he could post around on the studio walls.
How large is it? Well after about 2 hours of working with this image, I finally got something out of it. So Im about to show you some of the images from this one image. Keep in mind that to do this, I had to open the image, Print Screen my monitor to import that into paint, save the SS, and edit my desktop out to make them look nice. I have all the original SS's that I took if you wanted me to upload them. ANY quality loss in these pictures is from the PrntScrn and editing process. So first off, here are the dimensions of the image itself: