An app to apply filters to the camera stream or to a stored photo.

This project is based on an earlier app named 'FilterCam'. I had to re-write all of the underlying filter and graphics code because Apple is dropping support for OpenGL(ES). I was originally using the nifty GPUImage library from Brad Larsen, but now I am using the built in CIFilter classes and using Metal for graphics processing. Also, I had to change the name because of an App Store conflict.

One day, I'll get around to adding screenshots, but the basic set of functionality includes:

• browse all available filters, assign ratings, hide/show, add to favourites. You can also change some of the parameters (the scalar or colour ones) and see the effect
  • there are currently ~190 filters defined and an additional 500+ colour transforms available (lookup filters) that are based on available Photoshop presets
  • because of this, filters are assigned to 'categories', and users can hide ones they don't want to see
  • current categories are based on the source of the transform (e.g. Photoshop preset) or the Apple filter types. Expect these to be re-organsied drastically
• choose a sample image (used for browsing the filters). There are some built-in samples or you can use any photo
• choose a blend image, for those filters that combine multple images. There are some built-in blend images, or you can use any photo
• there is a limited set of Style Transfer filters available - the usual group that is freely available (The Scream etc). I will be working on generating new ones, but that takes a lot of time and the tools are a bit lacking right now
• edit an image from your photo albums.
• there is a simple and limited theme manager that lets you choose between a few themes (light, dark, red, blue). I plan on making this configurable eventually
• the editing feature is actually fairly good now. It currently has support for:
  • applying multiple filters and viewing the filter stack
  • undo the last filter
  • toggle between original/current images
  • split screen preview of original/current image
  • contextual help text everywhere (very basic though)
  • Basic Adjustments (exposure, contrast etc.)
  • Color filters (all of them)
  • Style Transfer
  • Tone Curves
  • Color Adjustments (ROYGBIV)
  • Sharpening and Noise reduction
  • Crop/Zoom/Rotate

I make fairly extensive use of the following pods:

• Neon: very useful functions for laying out views relative to each other (Storyboards are very hard to use in this app because of the need to constantly resize based on content)
• Chameleon: a set of 'flat' colours and associated utilities that I use to colour the UI
• iCarousel: a horizontally scrolling list that can contain images etc.
• SwiftyBeaver: logging utilities
• SwiftyJSON: JSON parsing
• Cosmos: a star rating widget