2 Replies Latest reply on Jun 25, 2017 4:33 PM by mbwaterdog

    How to determine actual life-size length (in cm) of object in photo?


      Hi everyone,


      I am taking photos of sea urchins with a GoPro at a fixed distance (1 meter) and I need to determine the sizes of urchins in photos using Photoshop. I do have a scaler in my photos, so I know exactly how long 1 cm through 20 cm actually is. In order to find the lengths of my sea urchins, should I measure the distance in pixels, then convert that to cm? In other words, I can measure the number pixels in my 1 cm scaler, then apply that to how many pixels are in the length of one urchin. Is this the correct method, or is there a more accurate/efficient way to do this?