Step 9: In the example, copy where the pixel's
red value
is modified into your for loop. Modify what you copied to increase
the red value. Example of increasing the red value by 10:
for (let i = 0; i < imageData.data.length; i += 4) {
imageData.data[i + 0] += 10
}
You will put the modified image data back on the canvas in the next step.