A friend of mine sent me an image that is almost completely transparent as a sort of encrypted code type of thing, the only way I can see it is if I go into the default paint program and use the bucket tool, and even then I just see a colorless, slightly inaccurate outline of the image.
So I looked around for alternatives, but after googling "How to make a transparent image non transparent" and a bunch of versions of that question I just got one answer from this site on how to do it with Adobe Photoshop (which I don't want to have to pay for just for this) or from some other site with some complex program. I heard that GIMP is a decent free bit of photo editing software and downloaded it before messing around for a bit to see if I could find a way to turn the image from almost completely transparent to its original format.
I failed, only managing to load the nearly transparent image and fool around with it before ultimately giving up, the closest I got was when I adjusted the brightness and contrast (if I remember correctly) and got a similar, inaccurate, outline of the image but in a orange/red version with a black background rather than just black and white that I get from using paints bucket tool.
Help would be appreciated, however if its not possible to revert the image back to its original format then I'm alright, I just want to know if its possible or not and if it is then how I can do it with GIMP (or, if necessary; some other free, clean, and easy to download/use software)