In my work, I do a lot copy paste graphs or photos between folders. Can keyloggers steal these graphs or photos by transmitting them? Thanks.
From 10 Immutable Laws of Security...
Law #1: If a bad guy can persuade you to run his program on your computer, it's not your computer anymore
If a "keylogger" of any form is running on your computer, then this has probably already happened. The bad guy's program can pretty well do anything he's designed it to do.
If this has happened to you, it's time to call Game Over and nuke from orbit.
A "pure" keylogger would record ctrl c ctrl v at best, which is not particularly useful in this context. But pure keyloggers are usually just one sub-component of malwares which have many more features. So if you have malware on your machine, it can potentially do whatever it wants, including taking screenshots at any time and sending any files to a remote machine.