I am getting v. confused.

When I render this file (ss.pov):

camera {
  location <.2,0,2.4>
  look_at <0,0,0>
  angle 36

}


sphere{<0,0,0>,.5
    texture {pigment {color rgb<118,23,255>}}
    }


With this command:
povray ss.pov

I get a white circle on a black background

When I do it with this command:
povray ss.pov Output_Alpha=True

I get a magenta circle on an alpha channel background.

I assumed that, in each case, since there was no light source, the whole scene
should be black.  Can someone tell me where the light comes from?
.... and why rendering with an alpha channel produces different results (outside
the alpha area)?

Thanks


Gobnat

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