comparing bitmaps

This is a discussion on comparing bitmaps within the C++ Programming forums, part of the General Programming Boards category; Hi All, Can anybody sugest me a way to compare two bitmaps and create a third bitmap showing the difference ...

  1. #1
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    comparing bitmaps

    Hi All,

    Can anybody sugest me a way to compare two bitmaps
    and create a third bitmap showing the difference of the two.
    Alternatively, can anyone point me to a tool that would do
    this for me ?

    Thanks,

    bigSteve


    bigSteve

  2. #2
    pronounced 'fib' FillYourBrain's Avatar
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    what exactly is "the difference" When a pixel is a different color you output what? That's a strange application and I wonder what you want it for. What purpose will it serve? If you just want to know which pixels are not the same, Salem's little nexted loop is all you need to do. Then I suppose black could mean same and white could mean different. Useless though.
    "You are stupid! You are stupid! Oh, and don't forget, you are STUPID!" - Dexter

  3. #3
    Code Monkey Davros's Avatar
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    Could images be of different size?
    OS: Windows XP
    Compilers: MinGW (Code::Blocks), BCB 5

    BigAngryDog.com

  4. #4
    Confused Magos's Avatar
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    Originally posted by FillYourBrain
    Useless though.
    Not quite. This method is often used in motion detectors, comparing two frames and registering changes (Changes in the pixels = movement).
    I guess there is some similar function in optical mice/stuff too.
    MagosX.com

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