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Alex Rupérez

Link: http://j.mp/2IcxqG1
Published: 29 Mar 08:10
I starred muukii/LightRoom at GitHub.
Easy Chaining ImageFilter with CoreImage 📸
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LightRoom

CI Status Version License Platform

Easy Chaining ImageFilter with CoreImage

My App Fil is powered by LightRoom.


Installation

LightRoom is available through CocoaPods. To install it, simply add the following line to your Podfile:

pod "LightRoom"

Usage

First, create FilterComponents. Then create a FilterChain using them.

Chaining

image1 >>> colorControl --* addition
             blendImage >>> addition --* overlay
            image2 >>> colorControl2 >>> overlay

Multiple Chaining

You can connect FilterChains with each other using >>>

let colorControl = LightRoom.ColorAdjustment.ExposureAdjust(ev: 1)

let chain1 = FilterChain { (image: CIImage?) -> CIImage? in
    image >>> colorControl
    return colorControl.outputImage
}

let colorControl2 = LightRoom.ColorAdjustment.ColorControls(saturation: 0.3, brightness: 0, contrast: 1)
let chain2 = FilterChain { (image: CIImage?) -> CIImage? in
    image >>> colorControl2
    return colorControl2.outputImage
}

image1 >>> chain1 >>> chain2
chain2.outputImage

Performance

FilterComponent has a CIFilter, which is cached and will be created only once.

This structure is advantageous in performance, and is great for real-time filtering camera implementation.