Hi all...

I have some simple code that grabs an image, finds every pixel that's more blue than red or green, and turns those pixels transparent. That all seems to work. But I also want to save a new PNG that includes those transparent pixels. That part doesn't seem to work -- the output PNG is just solid black. What am I doing wrong here?

Thanks in advance!

void setup() {
 
  int imageWidth = 2048;
  int imageHeight = 1216;
  color clear = color(0x00000000);

  size(imageWidth,imageHeight);
 
  PGraphics outputImage;
  outputImage = createGraphics(imageWidth, imageHeight, P2D);
 
  PImage testInputImage = new PImage();
  testInputImage = loadImage("imputImage.png");

  outputImage.beginDraw();
  for (int i = 0; i < imageWidth; i++) {
    for (int j = 0; j < imageHeight; j++) {
      color thisPoint = testInputImage.get(i,j);
      if ((blue(thisPoint) >= green(thisPoint)) && (blue(thisPoint) >= red(thisPoint))) {
            stroke(clear);
      } else {
        stroke(testInputImage.get(i, j));
      }

      point(i,j);
      outputImage.point(i,j);
    }
  }
  outputImage.endDraw();
  outputImage.save("outputImage.png");
}