This is an online photocopy of the original of the children's book Book of Trades by Frederick Warne and Co., (1880?) a picture book of trades includes printers, tailors, carpenters, watchmaker, etc.

Your digital photo comprises a certain number of dots in the x and y directions. What happens to the print image quality as you "stretch" those dots out to larger and larger pictures? (Note: This experiment studies the dots per inch in...