Quote Originally Posted by ravells View Post
Good article on minimising jpeg file sizes here.

Good article on minimising png file sizes here.

I've also just discovered that .jpg and .jpeg are the same (someone please correct me if I'm wrong!)
Nice links except that as I read the first line it was wrong ! A JPEG is usually 24 bit but you can also do a greyscale JPG too. Thats a single channel version. That would sound like it would be 1/3 size but usually its nowhere near as small as that but it is smaller than a color one by maybe 20%.