When layering the same video I am getting a seem line appearing where my mask line is at in my video... It appears as if one side of the seem is slightly darker than the other side of the seem in the video despite being the same video file. I copied and layered one of the same video line over the other and masked one half of the video out and there is a seem running down my video... Do we know why this is? Thank you.
Use the Alpha Add blending mode. By default AE's transparency blending is not linear.
I tried adding alpha add blending too each layer and I was still seeing that seam running down my vid were one of the masks are, then to just the layer that was causing the most problems for my comp but still didn't work. I apologize if this is a newbie question, but I couldn't really find any solid free tutorial on blending modes. If needed or wanted, I can add screenshots tomorrow of what I'm seeing.