The section 2.3.4.1 in pov-ray tutorial
(http://www.povray.org/documentation/3.7.0/t2_3.html#t2_3_4) said, the following
options

+w640 +h480 +a0.3 +am1 +fN -d File_Gamma=sRGB
Output_File_Name=gamma_showcase.png

+w640 +h480 +a0.3 +am1 +fN -d File_Gamma=1.0
Output_File_Name=gamma_showcase_linear.png

would generate two images and they should look identical in
viewing software. I can not get such results. Why different File_Gammas can
generate same results?

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