Question 18.31

1. Your digital camera probably takes pictures with an aspect ratio of 4 to 3, meaning that the longer side is 4/3 times as long (in pixels) as the shorter side. For example, you probably can take a “small” picture with 640 pixels by 480 pixels, or perhaps a “large” picture with 2592 pixels by 1944 pixels (for a total of pixels, or just a little more than 5 megapixels). Photographic prints from your digital camera are available in various sizes of paper, quoted in inches: , and .

  1. Which of the paper sizes, if any, is geometrically similar to the original digital image?
  2. If a print is made by scaling the shorter side of the digital image to be exactly 4 in., how long should the longer side of the image be on the print?
  3. If a print is made by scaling the longer side of the digital image to be exactly 6 in., how long should the shorter side of the image be on the print? (Hint: The paper isn’t wide enough!)

1.

(a) None

(b)

(c)