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Resolution for large photo sign

Discussion in 'Digital Printing' started by Stacey K, Oct 15, 2018.

  1. Stacey K

    Stacey K Getting Back in the Game

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    What type of photo resolution would I need to make a 3'x5' sign of a photo of a tractor for a barn that would be installed about 30' high on the front of a barn? The next issue is finding a photo of an Oliver 2150 tractor. Customer is an elderly man who is selling his farm to his son, the sign would be a gift. Thanks!
     
  2. ewded

    ewded Member

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    In my experience 50 dpi is acceptable for banners 75 is okay.
     
  3. Solventinkjet

    Solventinkjet DIY Printer Fixing Guide

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    Denver, CO
    4320 x 2592 will get you a resolution of 72 dpi. At that height and size it should look fine. Essentially any image from a modern cell phone or digital camera will be more than enough.
     
  4. myront

    myront CorelDRAW is best

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    Agree here. Make sure it's the original and not snagged off facebook or passed through many hands with their own little photoshop/photopaint trickery applied.. Facebook downsamples photos.
     
    • Agree Agree x 2
  5. shoresigns

    shoresigns Very Active Member

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    Believe it or not, 50–75ppi is actually a lot more than you really need in this case. The further the viewing distance, the less pixels you need. A sign seen from 30 feet away would only need to be around 20ppi for the image to look good.

    Here's the formula:
    600 / viewing distance (feet) = minimum resolution (ppi)
    i.e. 600 / 30 ft = 20 ppi

    And hopefully I don't need to do the rest of the math for you, but 60"W x 36"H @ 20ppi = 1200x720 pixels. Note that if you were to print a 1200x720 pixel image on this sign, you will see square pixels clearly in the print before you install it, since each pixel will be 1/20 of an inch.
     
  6. 36 dpi works great with me.
     
  7. Stacey K

    Stacey K Getting Back in the Game

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    Thanks everyone, this helps!
     
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