iPhone 
You can edit photos right on iPhone. While viewing a photo full-screen, tap Edit, then tap one of the tools.
Auto-enhance improves a photo’s exposure, contrast, saturation, and other qualities.
Photo filters lets you apply different color effects, including black & white.
With the Remove Red-eye tool, tap each eye that needs correcting.
Crop by dragging the corners of the grid.
Drag the photo to reposition it, then tap Crop.
Don’t like the results? Tap the tool again to return to the original.
Trim a video. Tap the screen to display the controls, drag either end of the frame viewer, then tap Trim.
Important: If you choose Trim Original, the trimmed frames are permanently deleted from the original video. If you choose “Save as New Clip,” a new trimmed video clip is saved in your Camera Roll album and the original video is unaffected.
Set the Slo-Mo section of a video. (iPhone 5s) Use the vertical bars beneath the frame viewer to set the section of the video you want to play in slow motion.