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How to convert pixels to mm?

lyndalouis -  
Hello,
I am working on an image correlation software, it gives the deformation in pixels.
Please, how can I convert it to mm?
Thank you.

2 answers

  1.  Pierrecastor Moderator
    Hello

    To calculate that, you also need to know the resolution of the image.

    --
    Light a fire for someone and they'll be warm for the rest of the day. Set a man on fire and he'll be warm for the rest of his life.
    -Terry Pratchett-
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    1. lyndalouis Author
      Is it the parameters of these little squares that we call resolution?
      Because I am working with a grid that I draw and the step of this grid is 10*10 pixels
      Does this mean that my resolution is 100 pixels?
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      1. Pierrecastor Moderator
        Resolution is the number of pixels per square inch or per square centimeter.

        It is often given in dpi.
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      3. Pierrecastor Moderator
        Oops, the idiot.

        Yes, it's indeed based on distance per unit.

        I don't know what was going through my mind.
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