Zipping files - don't really reduce any file size

Oi!

Another problemoz of mine. I made a folder and threw some pix in it. Then I zipped it cause I was going to send them to a friend. But, when I checked the file size on the .zip, it’s the same as the original folder. Isn’t zipping supposed to reduce file size? Another way to do this, or am I just stupid? =)

It’s a tosh by the way!