iPhone shows 1.3GB of photos but I don't have any Edited: 

Orginal question: 
My iPhone 4S shows that I have 1.3GB of photos but I don't have any. 
How to empty this amount of space and make it available?

I go to "settings" -> "general" -> "usage" -> "manage storage" and then "Photos &amp; Camera" shows that there is 1.3GB of using space but I have no photos at all. So I go to that "Photos &amp; Camera" and I see that "Shared Photo Stream" takes most of it, so about 1.3GB but I don't share any photos. 
But! If I take one photo using camera and then it appears in "Photos" -> "Camera Roll" then I go to "settings" -> "general" -> "usage" -> "manage storage" -> "Photos &amp; Camera" then it shows that "Photo Library" uses almost 1.3GB of storage space in my iPhone and "Shared Photo Stream" almost none. And if I delete this one photo then "Shared Photo Stream" shows that there is almost 1.3GB using space and "Photo Library" uses almost none. 

I use iOS 8 but before when there was iOS7 the problem was the same and it was the main reason why I updated to iOS8 because I was hopping it resolves this problem but the problem is still there.

Help please
End of original question.

Added latter:
No matter which iOS and build is installed same problem was even if the newest iOS is installed. I said was coz
only solution is to instal for example iExplorer on PC then plug in iPhone to PC and using iExplorer delete all picture cache data on iPhone. It seams picture cache on iPhone is kept even if iPhone was restored to complete factory setting and set as new. As I said problem solved by third party software. Apple has had no idea how to fix it.
I'm pretty sure I have your answer!  I just had the same problem myself.

It seems that the Photos app has a "nice feature" called "Recently Deleted" that CONTINUES TO KEEP deleted photos on your device for a certain period of time.  SO ... Just click on your photos app, then click on its RECENTLY DELETED folder, then empty its contents.

Hope that helps!