Function Extract

src/apps/ociolutimage/main.cpp:99–131

void Extract(int cubesize, int maxwidth,
             const std::string & inputfile,
             const std::string & outputfile)
{
    OCIO::ImageIO img(inputfile);

    int width = 0;
    int height = 0;
    GetLutImageSize(width, height, cubesize, maxwidth);

    if (img.getWidth() != width || img.getHeight() != height)
    {
        std::ostringstream os;
        os << "Image does not have expected dimensions. ";
        os << "Expected " << width << "x" << height << ", ";
        os << "Found " << img.getWidth() << "x" << img.getHeight();
        throw OCIO::Exception(os.str().c_str());
    }

    if (img.getNumChannels() != 3)
    {
        throw OCIO::Exception("Image must have 3 channels.");
    }

    int lut3DNumPixels = cubesize*cubesize*cubesize;

    if (img.getWidth() * img.getHeight() < lut3DNumPixels)
    {
        throw OCIO::Exception("Image is not large enough to contain expected 3D LUT.");
    }

    WriteLut3D(outputfile, (float*) img.getData(), cubesize);
}