creating an image from CImage
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Thread: creating an image from CImage

  1. #1
    Join Date
    Jul 2008
    Posts
    11

    creating an image from CImage

    Greetings All,

    simple question, I have raw image data ( unsigned char* ), image height and width, and all the relevant info for the image and I need to use CImage to save a Jpg file...

    Saving the image is fine, but what I can't figure out is how to create a CImage and give it the raw image data, if this can be done with as little microsoftisms as possible that would be nice ( although I figure this isn't the case! )...

    Any help on this matter would be appreciated....

    Code:
    unsigned char* ptr;    // this has image data
    unsigned int width;
    unsigned int height;
    
    CImage image;
    
    // what goes here???
    // or more specifically, how can I use the above vars in this CImage....
    
    image.Save( "myImage.jpg", Gdiplus::ImageFormatJPEG );
    Many thanks.

  2. #2
    Join Date
    Feb 2005
    Posts
    2,160

    Re: creating an image from CImage

    Use CImage::Create() to set the height, width, and BPP, then use CImage::GetBits() to get a pointer to the actual bits. Use this pointer as a destination and copy your bit data to the destination. One caveat: the actual pixel buffer is a "bottom-up" buffer so GetBits() will return a pointer near the end of the pixel buffer. You fill the buffer "backwards" so to speak. See:

    ms-help://MS.VSCC.v80/MS.MSDN.v80/MS.VisualStudio.v80.en/dv_vclib/html/48e842f6-cffa-4e61-8259-e8255a31739c.htm

    or

    http://msdn.microsoft.com/en-us/library/zx1ex9b5.aspx

  3. #3
    Join Date
    Jul 2008
    Posts
    11

    Re: creating an image from CImage

    Ok, many thanks hoxsiew for your reply....

    It all makes sense theoretically, however, you can probably guess what my problem is... getting a black image. Am I doing this right? I'm not to bothered at the mo about orientation.

    Code:
    unsigned char* ptr;    // this has image data
    unsigned int width;
    unsigned int height;
    
    CImage image;
    
    image.Create( width, height, 32 );
    unsigned char* imagePtr = static_cast< unsigned char* >( image.GetBits() );
    imagePtr -= ( width * height );
    *imagePtr = *ptr;
    
    image.Save( "myImage.jpg", Gdiplus::ImageFormatJPEG );
    Many thanks for your help...
    Last edited by lemonsF; August 13th, 2009 at 09:15 AM.

  4. #4
    Join Date
    Jul 2008
    Posts
    11

    Post Re: creating an image from CImage

    Oooops... school boy error...

    Code:
    for ( unsigned int i = 0 ; i < ( width * height ); ++i )
    {
    	*imagePtr = *ptr;
            --imagePtr;
    	++ptr;
    }
    Getting closer.......i'll be there in a bit

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