How to delete imported photos from iphone 4 with ios 7?

I imported my pictures from my pc through itunes but then synced there's no option of deleting them. There's no option for unsync too.

Just remove the tick of the box on iTunes where it says "sync photos" and then click apply / sync

that'll do it

If you have iOS 7, you can use Image Capture on your Mac to delete photos from the iPhone without importing them:

Plug the iPhone to your Mac with the iPhone cable;
Quit iPhoto if it launches automatically;
Launch Image Capture;
Select the photos you want to delete;
Click the red icon to delete the photos.

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