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In a java project when trying to access pixel value, I am getting negative value.

Code ::

Mat srcImage = imageToMatFormat(imgSource);
    byte[]  buffer = new byte[3];
    for (int x = 0; x < srcImage.rows(); x++) {
        for (int y = 0; y < srcImage.cols(); y++) {
            srcImage.get(x, y, buffer);
            if(buffer[0]!=0)
                System.out.println(buffer[0] + buffer[1] + buffer[2]);
        }
    }

Some values that I am getting is

126-119-115
125-120-116
124-121-117

So what does this negative number in here signi