image convertion jpg -> pgm

This is a discussion on image convertion jpg -> pgm within the C++ Programming forums, part of the General Programming Boards category; i am looking for something that i can read in a .jpg file and convert it to a pgm file ...

  1. #1
    Registered User AtomRiot's Avatar
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    image convertion jpg -> pgm

    i am looking for something that i can read in a .jpg file and convert it to a pgm file then write that file, does anyone know anythign like this. i have looked at many libraries and most of them do a crap load of stuff but they dont end up working anyhow. i just need this simple task, and i would preffer to program it but i do not know how to go about this but i thought that there might be something our there that can guide me along the way. i am using msvc++ and the end product will be done in win32 api but for now this part can be done in dos until i get something working. any input would be awsome.
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  2. #2
    Code Monkey Davros's Avatar
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    I believe PGM is a unix greyscale bitmap format, no wonder you cannot find many/any Windows toolkits which support it.

    However, I found this link for you, which describes the PGM file format.

    http://www.cs.ubc.ca/spider/ladic/text/pgm.txt
    Last edited by Davros; 02-01-2003 at 04:58 AM.
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    I have an e-book and there is a section to convert a PNG to bitmap if that is any good to you. The book is 13.5MB and is for Borland C++ Builder.

    Let me know if you want it.

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    Registered User AtomRiot's Avatar
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    well, what i need is the pgm file format, i know what structure it is in its just the opening and decompressing the jpg thats a problem
    is there a way just to convert the jpg to raw data? and yes i have found tuns of linux / unix applications and source but unfortunately the people that pay my do not need / use linux / unix so i am out of luck there.
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  5. #5
    I lurk
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    http://www.wotsit.org
    The JPEG specification has code for decompressing and compressing JPEGs with it. Have fun!

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    Registered User AtomRiot's Avatar
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    thanks i will give it a look
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