Printer specifications are real and accurate and meaningful, but are not to be confused with image resolution. Printer ink dots and image pixels are simply very different things, and one color image pixel requires many printer ink dots. This is why we need a 1200 dpi printer (ink dots) to print an image at 250 dpi (pixels).
Q: What are the standard postcard sizes you offer? A: For flat standard postcards, available sizes are as follows: 4 x 6, 4.25 x 6, 5 x 7, 5.5 x 8.5, 6 x 9, and 6 x 11. Folded postcards have 2 kinds: half-folds and tri-folds.
Rating Newest Oldest. Best Answer: In order for a card to be mailed with postcard rates: Minimum measurements: 3 1/2 x 5 inches Maximum measurements: 4 1/4 x 6 inches. Anything smaller is not mailable. Anything over that size will have to pay full first-class postage. Source(s): I do a lot of mailings. tonalc1 Â· 8 years ago.