There are several different file types: jpg, tif, png, raw, bmp & gif.
Each has a specific purpose and use.
JPG: Probably the most common and versatile used in digital photography. It is a file that can be used easily on the web and although it is a “lossy” format (meaning it loses some information and quality of the original photography whenever it is saved), the quality of the photo is still very strong. The size of the images for the quality is really good. Its great for the most photo sharing.
TIFF: This file is a “lossless” file, meaning all the original information from when you took your photo is still in there. This is great for photos that are underexposed or need more work within the colors. This is the best quality digital photograph that you can have. However, the file sizes are very large & the are not accepted for display on most web browsers. I rarely use this type of photography.
PNG: In some ways it surpasses .jpgs because it is a lossless file that can be viewed on the web. It still is not as small of a file size as a .jpg. This file also can transparent background (which a jpg cannot), and although not seen on some of the old browsers, its the transparency is viewed on firefox, safari & IE 7 or later browsers. I also use .pngs in print design a lot when I’m layer pictures with logos or other imagery.
RAW: ”Raw image formats” are a nearly lossless file that is on many digital cameras. Its file size is smaller than a .tif while still keeping all the variations of color. A lot of professional photographers shoot with this format & there are many programs that will convert them before opening in photoshop.
GIF & BMP’s you can read about here. I rarely use them and never in relation to photography.
The picture that I’ve posted below is a PNG of Noah that I edited in Picnik. I used the 1960′s filter that rounds corners, but also rounded them a little further in “frames”. The corners, although you can’t tell on my white background are transparent.














































