keying and
compositing
green screen keying, compositing, and color grading in Nuke
2024
As part of the project “Through your eyes”, I had to key, compose, and color grade the shots I had with my subject on the green screen, to replace the background with the environments I had designed.
Shot 1
To key the first shot I had to use three different keys: First I keyed the body with a keylight, then I keyed the legs separately because they had a lot of green spill and finally, I added a luminance key to add details to the hair. I combined all three keys and removed the tracking markers from the shot. One of the tracking markers was coming into contact with the subject's hair so I had to roto paint it out in those frames.
After my keying was done, I went on to compositing. I color graded the shot to match the background and added fog to the scene to give it a more scary and unsettling feeling. To add the fog I simply added two cards of white noise to the 3D scene and added a bit of animated movement to it to make the fog look more realistic.
To key the first shot I had to use three different keys: First I keyed the body with a keylight, then I keyed the legs separately because they had a lot of green spill and finally, I added a luminance key to add details to the hair. I combined all three keys and removed the tracking markers from the shot. One of the tracking markers was coming into contact with the subject's hair so I had to roto paint it out in those frames.
After my keying was done, I went on to compositing. I color graded the shot to match the background and added fog to the scene to give it a more scary and unsettling feeling. To add the fog I simply added two cards of white noise to the 3D scene and added a bit of animated movement to it to make the fog look more realistic.
Shot 2
The keying for this shot was a bit complicated. I had to do a separate key for the hand, the shoulder, and the hair because there was a lot of green spill on the clothes and the focus was not maintained throughout the shot. Additionally, most of the tracking markers interacted with her hair which meant that I had to paint them out frame by frame.
After the keying was complete, I color-graded the shot. This step was also complicated because the character walks from a dark environment to a light one, so I had to mimic the color change of the light over time to make it look realistic.
Once most of the compositing was complete, I added a fire element to the fireplace in the scene. I tracked the fire logs and used that tracked transform to make the fire stick to the fireplace.