How to open attached email image through App

I want to create an app which opens image from email attachment. Here I able to open pdf which is an attachment to my email, I know the setting in inf开发者_JAVA百科o.plist only for open pdf file through my app. Can anyone tell me how to open png or jpg format image through app? Can anyone tell me setting in info.plist for opening images through app?

Check out this answer regarding how to associate file types with an application: How do I associate file types with an iPhone application?