Excuse me, master: I want to make a printed collection of calligraphy and painting works (especially large ones). What camera should I choose or what technology and technique should I adopt?

The camera is not important. It is still possible to choose10 megapixel SLR. The key is to choose the lens, and the distortion must be minimal. I suggest you choose a 50mm macro lens, which can shoot large scenes or local close-ups. There is nothing special in technology. You must keep the camera completely parallel to the painting. Visual inspection is not enough. Buy a checkpoint. Choose a small aperture when shooting to increase the depth of field as much as possible. A tripod is necessary. Don't expect you to hold it.