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Thread: How to view and edit the bits of a jpg image file?

  1. #1
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    Default How to view and edit the bits of a jpg image file?

    I want to edit jpg image file in binary form, so that I can can modify the LSB to make least difference with the original image.
    Stenography stuffs...
    Please help


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    Super Moderator Norm's Avatar
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    Default Re: How to view and edit the bits of a jpg image file?

    I'm not sure how you can read and modify the contents of a jpeg file. I think the image has to be read into an Image object which allows access to the bytes defining the pixels.
    Also I'm not sure if writing an image to a jpeg file will preserve the pixels. Some writing algorithms compress/change pixels when a jpeg file is written. You'd need to do some research or testing to see if that is the case.

    Is this the same topic: HELP: Hiding files(any type such .doc,.txt etc) inside an Image file(preferbly jpg) aka Steganography
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: How to view and edit the bits of a jpg image file?

    access to the bytes defining the pixels.
    Yes how can I do that?

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    Default Re: How to view and edit the bits of a jpg image file?

    Look at the BufferedImage class. It has methods for getting and setting pixels.
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: How to view and edit the bits of a jpg image file?

    Alright I succeeded in viewing/printing the jpg file in hex form(actually I converted hex from binary form)
    Anyways now I am looking for a way to retrieve the jpg image file back from hex values....
    Any idea?

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    Default Re: How to view and edit the bits of a jpg image file?

    I don't know the internal format of a jpeg file and have no idea how the contents of a jpeg file can be changed without passing the file through special code that does know how to read and write the bytes of jpeg files.
    If you don't understand my answer, don't ignore it, ask a question.

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