Re: Same image but one is darker?

I am just using one wide shot with record always on and the camera not moving. the guy is in the right hand side, then leaves and comes in the left hand side. Then I combine the two shots later to make it seem like he is in the same scene twice. I am using the transparent tool in premiere where I just split the scene in two bascially and combine the two images down the middle. But always one is a bit darker. maybe this can't be done in doors and I should stick to outdoors. But with everything manual the picture shouldn't change at all.
Very frustrating but thanks for your help.
TYEZ