At the How Stuff Works site at:
This is what Marshall Brain wrote in his article "How Centropolis FX Creates Visual Effects"
"For example, in "The Patriot," 150 of the shots in the film required visual effects. The rolls of film for these shots are sent to CFX to be scanned. CFX uses a Kodak Cineon scanner capable of up to 4,096 dots of resolution (4,096 X 3,112 dots per frame). "The Patriot" was scanned at 2K resolution (2,048 x 1,556 dots per frame), and the 150 shots and all of the intermediate files consumed about 1.6 terabytes of disk space."
I believe feature films were originally being scanned at 3000 lines in the beginning, but the 2048 line resolution is now the norm.
I know some of the members have more info on this.
Upon reflection, there may be some confusion about what you are asking. (Or maybe it is just me being confused?) :^0
For example, I believe a film quality straight lock off might be 2048 x 1556, but if you have to push in with a virtual camera move then the painting would have to be at a much larger resolution (or image size in Photo Shop) If you started with the same image size as the movie frame, then pushed in, you would get a break up or deterioration of the image.
Does this help any?