Thread: Writting watermark to image.

  1. #1
    Registered User
    Join Date
    Jun 2002

    Writting watermark to image.


    I am trying to figure out how to write a watermark text on an image I load. Would a simple textout do the job? I don't have experience in manipulating pixel data, so can somebody help me?

    Thanks a lot

  2. #2
    Join Date
    Feb 2003
    eh, using the plain old adding text to an image isnt going to do it for copyright, what you are looking for is steganography, where you actually plant data INTO the image , such as a copyright notice, instructions for a nuclear bomb,etc.

  3. #3
    unleashed alphaoide's Avatar
    Join Date
    Sep 2003
    Adobe Photoshop (if you have it 'cause it costs a fortune) has the feature to add watermark.
    source: compsci textbooks,, world wide web, common sense

  4. #4
    Registered User
    Join Date
    Jun 2002
    I don't care about adobe, I need to make a program so that it can take all pictures in a directory and add a specific watermark on 0,0 at the image, a string.
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  5. #5
    and the hat of int overfl Salem's Avatar
    Join Date
    Aug 2001
    The edge of the known universe
    What sort of answer are you looking for?

    Hard to imagine how you can write a program which doesn't involve pixel manipulation, but which does add a watermark to an image.

    Unless you're hoping for some magical API call which does it all for you

    void watermark( const char *filename, int x, int y, const char *text );
    int main ( int argc, char *argv[] ) {
      watermark( argv[1], 0, 0, argv[2] );
    Try GIMP (or free adobe). It has scripting facilities, so once you finally figure out what it is you want to do, then automating it would not be too difficult.

    In fact, how about this
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.

  6. #6
    Yes, my avatar is stolen anonytmouse's Avatar
    Join Date
    Dec 2002
    You'll need an image manipulation library. Depending on your OS/Compiler and the format of the images you may already have one capable of your needs. Otherwise, you can grab one from the web.

    GDI+ (MSVC only)

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