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Built-in Conversion

The Color Conversion C++ Class Library provides built-in conversion. To do a built-in conversion, follow the steps below:

  1. Define the following global variables:

    LColor clr; 
    CONVERSION_PARAMS params; 
    WHITEPOINT WPoint; 
    L_UCHAR *pRGBData; 
    L_UCHAR *pLABData; 
    L_INT nWidth; 
    L_INT nHeight; 
    L_INT nInAlign; 
    L_INT nOutAlign; 

  2. Set the conversion options by filling a CONVERSION_PARAMS structure:

    ZeroMemory(&params, sizeof(CONVERSION_PARAMS)); 
    params.pWpoint = &WPoint; 
    params.uStructSize = sizeof(CONVERSION_PARAMS); 
    params.pWpoint->nWhitePoint = CIELAB_D50; 
    params.nQuantization = 8; 
    params.nMethod = USE_BUILTIN; 
    params.nActiveMethod = USE_BUILTIN; 
    params.pWpoint->xWhite = 0.0; 
    params.pWpoint->yWhite = 0.0; 

  3. Initialize the color conversion object with LColor::Initialize():

    clr.Initialize (CCS_RGB, CCS_LAB, &params); 

  4. Convert from RGB to CIELab:

    clr.Convert (pRGBData, pLABData, nWidth, nHeight, nInAlign, nOutAlign); 

  5. At the end, free the color conversion object:

    clr.Free(); 

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