Reading the board
Each card shows the largest print the Met's file makes at 300 dpi without cropping — that's the sharpness you'd want for something you'll stand close to. The biggest file in this set isHydrangeas and Fowl, at 1,732 × 2,839 pixels: enough for a 5.8 × 9.5 in print at 300 dpi, or 11.5 × 18.9 in at poster sharpness.
Every page has a size chart against standard frames, the museum record, and the frame and light that make a print look like it cost more than it did. The file itself is free. It always was.