saving a photo in photoshop.

  

when you save a photo in photo shop you have to go to 'file', 'save as' then there is different things you could save your picture into, such as photoshop, jpg and Tiff.
photoshop - it is a large file size and it remembers all information, doesn't compress a image, but the bad size is you can only open it on certain computers which have photoshop.
Jpg - its fine for saving experimental images but compresses your images each time, so you loose a little bit of quality.
Tiff - you save your final images on, open it on any computer, although it takes up alot of memory space.