Third party apps such as Instagram are no longer the only way to get a hip, retro filter look on the iPhone camera. For those with iOS 7 and the iPhone 5 or later, eight filters are built right into the stock Camera app. These are titled Mono, Tonal, Noir, Fade, Chrome, Process, Transfer and Instant.
Each filter can be used with normal, flash, or HDR iPhone photos from the Camera Roll. To apply a filter to an existing image, start by opening the Photos app and viewing the photo you wish to change. Tap Edit in the upper right corner of the display. From the Edit Photo screen tap the center icon at the bottom that has three circles.