for information , official povray3.1 and megapov 0.7 don t give the same
output on alpha channel (windows versions, output alpha on, output format
PNG 8bits/channel).

megapov only have alpha in the background, while povray3.1 have the alpha
background too plus the two sphere with some alpha :

camera { location <1,1, -6> look_at <0, 1, 0> }

plane { y, 0 pigment { color rgbft <.9,.3,.7,0,0>}}

sphere { <1,1,0>, 1 pigment { color rgbft <.4,.5,.7,0,.5> }}
sphere { <-2,2,.4> , 1 pigment { color rgbft <.3,.5,.5,0,.5> }}

light_source { <10, 10, -10>, color rgb 1 }

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