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Convert from CV_32FC1 to binary

I have an image of type CV_32FC1 and I need to convert it binary without passing by the conversion to CV_8U since it seems to me that I'm loosing data by passing to it before going to binary.

result = Mat(res.size(),CV_32FC1); 
for (int i = 0; i < res.rows ; i ++)
        for (int j = 0; j < res.cols; j++)
        {
            result.at<float>(i,j) = (fabs(res.at<float>(i,j)) / 8);
        }
result.convertTo(result, CV_8U);
threshold(result, imageBinary, 30, 255, CV_THRESH_BINARY);

Any idea how can I achieve it?