Push after two months, oops

Week-2/Pictures/image-filter.js

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+let img;
+
+function preload() {
+  img = loadImage("/Images/monitoring-miku.png");
+}
+
+function setup() {
+  createCanvas(600, 600);
+  pixelDensity(1);
+}
+
+function draw() {
+  background(0);
+  image(img, 100, 100, 400, 400);
+  /* img.loadPixels();
+    for (let i = 0; i < img.pixels.length; i += 4) {
+        let red = img.pixels[i + 0];
+        let green = img.pixels[i + 1];
+        let blue = img.pixels[i + 2];
+        let alpha = img.pixels[i + 3];
+        img.pixels[i + 0] = red;
+        img.pixels[i + 1] = green;
+        img.pixels[i + 2] = blue;
+        img.pixels[i + 3] = alpha;
+    }
+    img.updatePixels(); */
+  img.loadPixels();
+  for (let y = 0; y < height; y++) {
+    for (let x = 0; x < width; x++) {
+      const index = (x + y * width) * 4;
+      img.pixels[index + 0] = mouseX;
+      img.pixels[index + 1] = mouseY;
+      img.pixels[index + 2] = y;
+      img.pixels[index + 3] = 100;
+    }
+  }
+  img.updatePixels();
+}