Tuesday, April 16, 2019

Core Image Filter Reference

Noah Gilmore (via Ryan McLeod):

CIFilter.io is a project I’ve been working on for the last few months, and today it’s open source. It has two parts:

  1. A website, https://cifilter.io, which lists all the available CIFilters, their information and examples of applying them
  2. An app which allows you to apply each CIFilter to various inputs, tune their parameters, and apply them to camera and photo library images


Apple has a page listing about 85% of the available filters, but it’s “no longer being updated”, and no new filters which were made available in iOS 10, 11, or 12 are listed there. If you Google CIThermal, for example, most of what you’ll find is iOS header dumps.

For the filters which are listed, many have incomplete documentation - for example, the inputSharpness parameter to CICheckerboardGenerator says[…] but doesn’t tell you what the parameter actually does. The examples on this page are also limited - for example, CISourceOutCompositing takes an inputImage and a backgroundImage. The page shows two images being composited, but doesn’t specify which image is which[…]

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