Use custom CoreFilter classes with filterWithName:
Use the same library interchangeably on Mac & iOS
Overlay photgraphs Photoshop style for custom image effects
Also sepia, black & white, hue & saturation, brightness, contrast, etc.
Inspired initially by Eric Silverberg's pre-iOS 5 image filtering class
Includes several retina & non-retina images for my custom effects loosely based on some popular ones in tap tap tap's Camera+ (Camera Plus as some type)
Utilizes CoreImage, CIImage and was one of if not the first OS repo on Github to share easy to use but professional CoreImage filtering techniques
Can be used by iOS devs levels beginner and up to create their own Instagram or Snapseed-like custom filters for the iPad, iPhone, iPod Touch
Installation
pod 'ImageFilters', :git => 'https://github.com/jameswomack/iOS-Image-Filters.git'