Today, we started off by filming the two scenes. For the staircase scene, we used a green screen in the alley next to the staircase so we could key the actor out in post production. We also took clean plates for both scenes. However at first, the shots were over-exposed, although they appeared properly exposed on the camera's LCD. We learnt from Mr Leong that, we should not trust the LCD display, and we should use the zebra lines to gauge the exposure of the scene instead. This did not occur to me at first as my DSLR's display has always given me accurate exposures.
After reshooting the staircase shots, we shot the post apocalyptic scene. The actor was supposed to move in from the right of the frame to the center of the frame. In this shot, we used a green screen to key out the actor as we would eventually replace the background. Unfortunately, the green screen could not cover the actor once he started moving. Moreover, there were shadows of the nearby trees falling on the ground, when it was supposed to a post apocalyptic scene and there were not supposed to be any neatly growing trees. Another problem was that the actor was too small in the shot.
Hence after receiving pointers from both Mr Leong and Mr Pang, we decided to reshoot both scenes. For the staircase scene, at first we ended the shot of the actor coming down the staircase with him turning around and walking forward. We then started the shot of him walking into the alley with him turning around and walking into the alley. This time, we had him turn around and stop at a certain spot. We then had him start at roughly the same position in front of the alley. Also, previously, the green screen represented the door and he would walk towards the green screen. This time, the green screen would be very close to the actor and the person holding it would move together with the actor, so we would have less rotoscoping to do. We would be able to just key the actor out and touch up with roto masks.
For the post apocalyptic scene, we did the same thing, having two people hold a green screen and follow the actor as he moves about the scene. We would then key out the actor and composite him back into the shot. This would enable us to place any CG elements behind the actor. Previously, we were not able to move the green screen as we only had 1 person holding the green screen. I also lowered the exposure and shot the dusk sky in case we needed it.
I think we learnt a lot today, in terms of the ways we could go about accomplishing our desired effect, the reasons advantages of shooting a scene one way over another, for example, more work in production and less work in post production in the case of moving the green screen.
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