File Compression

JPEG

JPEG is a file type that compresses what ever your saving and also decreases and throw's away a lot of data. If your doing a photoshop drawing or manipulation its probably best not to use this file type. It maybe considered to be used if your using it on a website, but even still there are better file types that can be used for online and webpages. JPEG would probably be the best quality for its file size for webpages.





GIFF

Giff file format would be best used when your dealing with an image that is mostly made up of block colours. because it cant really handle gradients, but it can handle low levels of transparency, PNG is mainly used for transparency.

PNG

PNG isnt as good quality as JPEG but it handles files with transparency really well, there isnt a difference from the original file and the saved output of a PNG and transparency. But the file size seems to be a lot bigger from JPEG on PNG-24. PNG 8 decreases the file size quite a lot but also decreases the overall quality of your image, it also gives you the option to choose between how much colours your want to use on your image, highest is 256 and the lowest is 2. Decreasing this also lowers your file size and overall quality.