How to stop pictures from being put BACK ON my iphone 4 when syncing?

So i had 1, 380 pics on my Iphone 4 (yes i know its alot!) and it was slowing my phone down of course! So i decided to connect my iphone and save them all on my computer so i would still have them, then delete them off my phone for space! So i did this successfully and deleted them. Then i decided to quickly sync my phone and hope to transfer some new music. After the regular 4 step syncing, i get back on my phone, open my pictures and All OF THE 1, 380 PICTURES ARE BACK! How do i STOP this from happening every time i sync! I just want to be able to transfer music and what not, not have to do this whole deleting process over and over again each time.

Delete them from Itunes not from the PC just from Itunes and then they wouldn't come up on your iphone anymore