Thus, all operations in the circuit between the output of gamma decoding circuit 6, the first gamma encoding circuit 7 and the second gamma encoding circuit 8 are performed at a gamma of unity, meaning that pixel values represent linear intensities, and {HEAD ~ the resulting superimposed illumination intensity} in a point of the projection surface 3 is {TAIL ~ a function} of the sum of the corresponding pixel values in the images being input to the first gamma encoding circuit 7 and to the second gamma encoding circuit 8 
Thus , all operations in the circuit between the output of gamma decoding circuit 6 , the first gamma encoding circuit 7 and the second gamma encoding circuit 8 are performed at a gamma of unity , meaning that pixel values represent linear intensities , and { HEAD ~ the resulting superimposed illumination intensity } in a point of the projection surface 3 is { TAIL ~ a function } of the sum of the corresponding pixel values in the images being input to the first gamma encoding circuit 7 and to the second gamma encoding circuit 8
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