Swift version: 5.6
Core Image has a number of interesting filters baked in, and an easy one to use is CIPixellate
– it pixellates images, making them appear blocky. You have control over how big each pixel block should be, so it’s suitable for a range of tasks.
Below is some sample code to get you started. To use it you should:
yourUIImage
to be whatever input UIImage
you want to use.print(processedImage.size)
line at the end for something more interesting – maybe you want to display the pixellated image somewhere?Here’s the code:
guard let currentCGImage = yourUIImage.cgImage else { return }
let currentCIImage = CIImage(cgImage: currentCGImage)
let filter = CIFilter(name: "CIPixellate")
filter?.setValue(currentCIImage, forKey: kCIInputImageKey)
filter?.setValue(12, forKey: kCIInputScaleKey)
guard let outputImage = filter?.outputImage else { return }
let context = CIContext()
if let cgimg = context.createCGImage(outputImage, from: outputImage.extent) {
let processedImage = UIImage(cgImage: cgimg)
print(processedImage.size)
}
Note: if you intend to run pixellation several times you’ll find it more efficient to save your CIContext
rather than keep recreating it.
SPONSORED Join a FREE crash course for mid/senior iOS devs who want to achieve an expert level of technical and practical skills – it’s the fast track to being a complete senior developer! Hurry up because it'll be available only until October 1st.
Sponsor Hacking with Swift and reach the world's largest Swift community!
Available from iOS 8.0
This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.
Link copied to your pasteboard.