How can I make a copy of a photo already taken so that I may edit one and keep the original?

[iMore Question]

I use an i5, ios8, and do not synch photos to the cloud.

 

[qbnkelt]

I use an i5, ios8, and do not synch photos to the cloud.

The simplest thing I do is to take a screenshot of the picture. That gets me a copy to manipulate.