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Asked: 2026-06-14T19:13:41+00:00

I need to calculate the image width and height from the actual image file,

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I need to calculate the image width and height from the actual image file, so I’m reading the image with open file. so I have bunch of characters and numbers and everything that seems meaningless and they are presenting rgb information probably.
I just want to calculate the size of the image with the raw file information
I am programming in Erlang language but the code in any language will help as we are working with raw file as long as we don’t use built-in libraries.

Thank you all in advance for help

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1 Answer

  1. Editorial Team

    I found the answer by going to details of each format,
    So it works like this

    JPG : you can find the width and height after the bytes “255,192,0,17,8” after that its the information for size

    PNG : you can find it after “IHDR”

    GIF : you can find it after “GIF89a”

    there are information for more but this is the most common image types on internet

    Thank you all for your time

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