How to get rid of photos from computer on an iPhone?

A while back I must have charged my phone on my computer and accidently (or automatically?) transferred all the pictures already on my computer into my 5c. It won't let me delete these pictures on the iPhone. How do I get rid of them? They're annoying, there's at least 1,500+ and I'm sure they take up a chunk of storage. I don't want them gone on the computer, just my iPhone. Thanks!

AlCapone2016-03-15T20:11:22Z

Delete them with iTunes on your computer with your iPhone attached with the charging cable.

Lucius T Fowler2016-03-15T18:54:11Z

The pictures don't use up so much storage, you can view and delete them one by one.

Just make sure you don't share them accidentally.