Did things

Day-2/pixels.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();
+}