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  1. #1
    Star Lounger
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    Determining dpi of attachment (5.0)

    I work in a job that requires photos be sent to me that are a minimum of 300 dpi. When I receive them, I have no way I know of checking. What can I click on to find out what the dpi of a JPEG or TIFF file is? I tried opening the file and going to "Properties" but that doesn't do it. Any help?

  2. #2
    Plutonium Lounger Leif's Avatar
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    Re: Determining dpi of attachment (5.0)

    What are you opening them with?
    .jpg's opened here with PhotoEditor show properties of (e.g.) 118 pixels/cm, which I would equate to 118x2.54 = 299.72 pixels/inch - on the basis a pixel is a dot, near as 300dpi as makes no difference.

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    Star Lounger
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    Re: Determining dpi of attachment (5.0)

    Ok, thanks, but see, that requires math. Plus where did the 2.54 number come from? I just thought there was a "properties" box somewhere that I couldn't find that would tell me what the dpi was. I constantly have people making nasty comments to me that I MUST send them photos that are at least 300 dpi. But I don't know how to come up with what the dpi is UNLESS I have scanned the picture myself.
    Is the "rule of thumb" to simply (?) multiply the number of pixels per cm by 2.54?

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    Plutonium Lounger Leif's Avatar
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    Re: Determining dpi of attachment (5.0)

    2.54 because one inch = 2.54 centimetres.
    300 dpi = 300/254 dpc (dots per centimetre) = 118.1dpc
    A typical digital photo I opened up taken at 2048x1536 resolution has properties of 118 pixels per centimetre.
    I would be happy to state that it was 300dpi.

  5. #5
    Star Lounger
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    Re: Determining dpi of attachment (5.0)

    So basically what you are telling me is:

    There is nothing I can click or or go to to DISPLAY what the dpi of a certain photo is.

    Instead, I must calculate by the process you describe.

  6. #6
    Plutonium Lounger Leif's Avatar
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    Re: Determining dpi of attachment (5.0)

    OK, further investigation shows this, using Windows 2000:

    From Explorer, double-click a jpg and it opens with PhotoEditor. Right_click properties shows a resolution of 118 pixels per centimetre.

    From Explorer, right_click the same file, select properties then summary. It shows a resolution of 300 x 300.
    Maybe that is what you need?
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