DPI of iphone photos?

Discussion in 'iPhone Tips, Help and Troubleshooting' started by heycal, Jun 8, 2018.

  1. heycal macrumors 6502a

    Joined:
    Jul 25, 2013
    #1
    Forgive my ignorance, but I know of nothing of photography or DPI or any of that. But I need to submit a photograph to accompany a 1/4 page advertisement in a newspaper. (The photo will run in black and white.)

    It must be submitted via email. I'm told the photo must be 300 DPI. I have an iphone 8. Can I take the picture on my phone and just send it in, or are special steps and/or a different camera needed?
     
  2. eatrains macrumors 6502

    Joined:
    Mar 11, 2006
    #2
    Just sending in the picture would most likely be fine. The printed DPI is ultimately a function of the photo's pixel resolution and the physical dimensions at which it will be printed. When you say it's a 1/4 page, do you know how many inches high and wide that is?
     
  3. heycal thread starter macrumors 6502a

    Joined:
    Jul 25, 2013
    #3
    I believe a quarter page would be about 5 x 7 inches. Some chance we'd go for a half page, which would be 8 x 11. Don't know if they would want a higher DPI for that or not.
     
  4. heycal thread starter macrumors 6502a

    Joined:
    Jul 25, 2013
    #4
    Is there any way to tell in advance for sure if an iphone photo with have the right "DPI"? I don't want to take a photo, send it in, and have them come back with "Nope, not good enough. Go out and a get another photo with a better camera and get it back to us before 5pm if you want your ad to be in this week's edition" or something.
     
  5. nieks macrumors 6502

    nieks

    Joined:
    Apr 7, 2016
    Location:
    The Netherlands
    #5
    A photo does not have DPI. A photo has a number of pixels in width and height. The DPI has to do with how you view it: a display has DPI (or actually: PPI, pixels per inch) and a newspaper or any other form of print has DPI: Dots per inch. It means that the image you submit should be big enough to be printed at 300 dots per inch.

    - Your iPhone 8 takes pictures at 4032x3024 pixels (which equals 12,192 Megapixels).
    - 4032/300=13.44 inch wide
    - 3024/300=10.08 inch high

    This effectively means that your phone is capable of shooting pictures that can be printed at 300 DPI at a maximum size of 13.44 by 10.08 inch. All you need to know now is: how big is the quarter page?
     
  6. heycal thread starter macrumors 6502a

    Joined:
    Jul 25, 2013
    #6
    Thanks. I daresay I almost understand this!:) Or at least the conclusion. I believe the quarter page is 5 by 7 inches. A half page, if I decide to go for that instead, I think is about 11 x 8 inches. Sounds like the iphone 8 can produce a picture that would work for either?
     

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