1
general::
Also, get the picture. Understand or infer the real import or substance of something. For example, He gestured to the waiter, who got the message and brought the bill, or Kate got the picture and decided to keep her mouth shut about the error. [Mid-1900s] Also see GET IT.
American Heritage Idioms
2
general::
Phrase(s): Get the message? [and] Get the picture?
Inf. Do you understand?; Are you able to figure out what is meant? (See also (Do you) get my drift?) • Things are tough around here, and we need everyone’s cooperation. Get the picture? • We don’t need lazy people around here. Get the message?
McGrawhill's American Idioms And Phrasal Verbs