How to find the CGColor at a CGPoint in a CGImage

Question

I am trying to find the CGColor at a CGPoint in a CGImage. There are multiple Stack Overflow posts that have something similar (like UIImage instead of CGImage or Objective C instead of Swift), but nothing specific enough to help me.

Does anyone know how to get the color at a point? Thanks.

Answer 1

Im assuming based on your macOS tag that you want to do this on macOS and thus can use NSImage and NSBitmapImageRep:

let cgImage = //your CGImage
let bitmap = NSBitmapImageRep(cgImage: cgImage)
if let colorAtPoint = bitmap.colorAt(x: 0, y: 0) {
  let cgColor = colorAtPoint.cgColor
  print(cgColor)
}