.gif, .jpg, save for web

They all look different than the .psd. The image generally comes out looking darker and more blurry :(

For the love of all that is good, help a n00b out.

Nos.

When you save for web, you compromise the quality.
You have to do that to make them lighter, thus load faster.

Go through the options in the menu, you'll see what does what and see when it looks ok.

Also, there's a difference between GIF and JPG, a good rule of thumb is;

For sharp images with not much colours / gradients, use GIF, as it preserves the sharpness, but compromises amount of colours.
For photos (in general), and pictures with lots of colours, but not that many pixel-sized details, go for JPG.

Good luck, and RTFM. :D

God Paav, I like your siggie.