Observe the screen

frame = gw.screenshot(sid)
with open("screen.jpg", "wb") as f:
    f.write(frame.jpeg)

small = gw.screenshot(sid, max_width=1280, quality=80)
roi = gw.screenshot(sid, x=100, y=200, w=800, h=600)

obs = gw.observe(sid, max_width=1280, mark=True)
print(len(obs.jpeg), "bytes")
print(len(obs.dirty), "changed regions")
print(len(obs.targets), "targets")

from glasswarp import targets_from_grid

targets = targets_from_grid(x0=100, y0=200, x1=900, y1=800, rows=8, cols=8)
obs = gw.observe(sid, mark=True, targets=targets)

rects = gw.dirty_rects(sid)
if rects:
    frame = gw.screenshot(sid)
    # ...feed to your model
else:
    ...  # nothing changed; skip the expensive call