It is indeed possible and was a feature added in the update V2, see the original blog post.
Make sure you are running the update. Then call R.see with a valid resolution argument e.g.
from sr.robot import *
R = robot()
markers = R.see(res=(640, 480))
#Now later in program
markers = R.see(res(1920×1440))
#Code that can see clearly now...
For all the arguments that can be used .see() the see github line 345