Pixel resolution and printing

Discussion in 'General Technical Discussion' started by Electromen, Oct 23, 2005.

  1. Let me know if I am thinking correctly.

    An image from a D70 is 3000x2000 pixels
    This means an 3000x2000=6 megapixal camera.

    In Photoshop an image 3000x2000 pixels at 300ppi is 10 x 6.67 inches
    3000 pixels / 300 pixels per inch = 10 inches
    2000 pixels / 300 pixels per inch = 6.67 inches

    The same image 3000x2000 at 72 ppi is 41.6 x 27.7 inches
    3000 pixels / 72 pixels per inch = 41.6 inches
    2000 pixels / 72 pixels per inch = 27.7 inches

    If each of these images is printed at the same size, say 20 x 30,
    the quality is the same because they are resized to 20 x 30 and still contain 2000 x 3000 pixels

    Am I right or confused?
     
    Last edited by a moderator: Oct 23, 2005
  2. Yes, you're correct. If you print that picture (without any resizing, uprezing, etc), you'll get a print of 20" x 30" at 100PPI.
     
  3. Thanks for the quick reply, It's starting to make sense.