Help! How to get these photos off!

I synced my Ipad2 to iTunes and it asked if I wanted to add photos. I said yes. What a big mistake. It downloaded 1700 pictures and it looks like three to four each. Can't delete off Ipad2.
Please ... What do I need to do? Read Manual and it didn't help.

 

In iTunes it if you go to photo tab you can select what pictures you want on iPad then connect your iPad up and it does it all for you

Cheers

Martin