How about posting an actual difference picture instead of letting everyone guess
what you want to show? The pictures look all the same as far as I am concerned.

Also, why are you using the decade old 3.6?

>
> --- testPov.pov
>
> camera {
>   location 5
>   look_at 0
> }
>
> light_source { 10 color rgb 1 }
>
> background { color rgb z }
>
> sphere { 0 1 texture { pigment { color x } } }
>
> --- end of testPov.pov
>
> --- testPov.ini
>
> Input_File_Name=testPov.pov
> Width=100
> Height=100
> Antialias=on
>
> --- end of testPov.ini
>
> --- Makefile
>
> oneShot:
>  povray testPov.ini -D +OoneShot.png
>
> fourFragments: firstFragment secondFragment thirdFragment fourthFragment
>
> firstFragment:
>  povray testPov.ini +SC1 +SR1 +EC50 +ER50 -D -OfirstFragment.png
>
> secondFragment:
>  povray testPov.ini +SC51 +SR1 +EC100 +ER50 -D -OsecondFragment.png
>
> thirdFragment:
>  povray testPov.ini +SC1 +SR51 +EC50 +ER100 -D -OthirdFragment.png
>
> fourthFragment:
>  povray testPov.ini +SC51 +SR51 +EC100 +ER100 -D -OfourthFragment.png
>
> --- end of Makefile
>
> Result of rendering in attachment. First line, two rendering in one pass and
> their difference. Second line, rendering in one pass, rendering by chunks, their
> difference (no antialising). Third line, rendering in one pass, rendering by
> chunks, their difference (with antialising, check the value of the pixels at the
> limit of the sphere and the background, they are not [0,0,0]). Both Gimp and my
> code give me the same differences so I'm confident the culprit is POV-Ray.
>
> Regards,
> Pascal

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