![example picture for update_pixels()](/images/reference/Py5Graphics_update_pixels_0.png)
```python
def setup():
g = py5.create_graphics(60, 60)
g.begin_draw()
g.background(255, 0, 0)
g.rect(10, 10, 40, 40)
g.load_pixels()
yellow = "#FF0"
for i in range(len(g.pixels) // 2):
g.pixels[i] = yellow
g.update_pixels()
g.end_draw()
py5.background(240)
py5.image(g, 20, 20)
```