![example picture for pixels[]](/images/reference/Py5Image_pixels_0.png)
```python
def setup():
global tower
tower = py5.load_image("tower.jpg")
dimension = tower.width * tower.height
tower.load_pixels()
for i in range(0, dimension, 2):
tower.pixels[i] = "#000"
tower.update_pixels()
def draw():
py5.image(tower, 0, 0)
```