User blog comment:Kida155/Things to Keep in Mind When Taking and Uploading Screenshots/@comment-17054927-20131011120436/@comment-1250011-20131011150113

They are nowhere near the same thing, haha.. Here's a guide explaining the differences between jpg, png, and gif... bmp is not as commonly used, and I don't use it myself, so I couldn't tell you the difference, honestly.

With a game like Terraria, where everything is composed of very sleek, high-quality pixels, you don't want to save images as jpgs or you'll lose quality when zoomed in.. Whereas png will not lose quality at all.