Invert image captured from ImageRenderer

Question

I have an image (outlined in red) displaying the result of ImageRenderer called on a canvas. I want to invert the colors such that the tiny resulting image is white text on a black background. I've tried various methods from stackoverflow to invert the colors but each results in a blank result. I'm fairly new to Swift and iOS development, whats the easiest way to invert the colors of that smaller result image?

      Button(action: {
        guard let image = ImageRenderer(content: canvas).uiImage else {
          // failed to render view as image
          return
        }
        UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil)
        resultImage = Image(uiImage: image)
      }){
        Text("Analyze")
      }

Answer 1

ColorInvert enables you to implement the features you want.

import SwiftUI

struct ContentView: View {
    
    var body: some View {
        
        VStack {
            Image("sample")
                .colorInvert()
                .padding()
        }
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}