view at step 408 via the control unit or manually by an operator at step 410 the line scan camera 300 captures a scan of the calibration color tile 120 and sends it to the control unit which receives the scan data and stores it to memory at step 412 the processor of the control unit determines the intensity and the color components of the light absorbed by the sensors in the line scan camera 300 as illustrated in fig5 a and 5b the line scan data can be visualized as a two dimensional plot with the pixel number the location along the linear array of pixels on the x axis and the light intensity level on the y axis the line scan data can be further broken down into the intensity levels of individual color components u2014 such as the red green blue rgb components u2014 at each pixel as previously mentioned a problem can arise when the calibration reference unit is elevated above the conveyor belt 102 because the intensity of light absorbed or reflected at each level can differ even if the same subject is scanned for example fig5 a illustrates the color component intensity analysis of a scan of a gray color tile 120 at the conveyor belt 102 level fig5 b illustrates the same at the elevated platform 104 level it is readily apparent that the intensity levels fig5 b is much higher than that of fig5 a almost to the point of saturating the light sensors and topping out this can cause errors.