How to move only certain pictures off iPhone?

This may be a dumb question but okay. I have over 4000 pictures on my iPhone 4s. I only want some of them on there, but I don't want to delete the rest. Is there a way I can move only certain pictures onto my computer or something?

I think you can only sync all your pictures but depending on how many you want on your computer email those ones to yourself then open it up on your computer and save it that way but if you have a ton of them that's going to take a while. You can re sync the file of pics from your phone back to your phone though.