Compositions
Digital compositing is a great expressive process for integrating multiple elements, often independent and from different sources, to form a seamless integrated scene. Marco Paolini said, “At the end of the day, it is not what you did, but how it looks.” Well, he is half right. Looks are 90% of the shot, but the other 90% is the how. Without reproducible techniques and systematic workflows, composition becomes a matter of luck and happenstance. Magic Dust Writer, based on the creative talent of cmiVFS and Steve Wright, is an example of a greenscreen key workflow process that produces great visual results, time and again.
3/31/08
Magic Dust Writer
The final Shake 4 node layout that was rendered with the Apple ProRes 422 codec. The talent was keyed through a three stage process, the pillar sills took two stages, the glass reflection was done in a single stage.
The talent was originally shot against a evenly lit greenscreen in 720x480 miniDV (compare this greenscreen to Subway Woman). Prior to pulling the key, the video was de-interlaced, then color spaced shifted to YUV in order to soften the jagged edges around the shoulders, which is primarily the result of 4:1:1 sampling. Once corrected, the color space was shifted back to RGB. Three CFC Keylight keys were used: garbage matte key, body key, and a hair key (bring out fine details of the hair). A soft background image wrap, reflecting the warm glow of the building, was created with a XOR and Inside node-based edge matte.
This is the original photograph used for the background shot. The cool image was desaturated with a Monochrome filter, the shadows darkened with a Compress node, and color shifted to create that warmer tone with a ContrastLum. The building shadows were created with a blurred Rotoscope piped into the mask of a Brightness node.
For all the Apple fans in the world, this is the primary image used to create the glass reflection that is composited over the building background and talent middle ground. A blue gradient was mixed with the Apple store image and faded for the final result.
The left and right window sills were created by rotoscoping out the right white pillar just outside the glass in this street image. The selected feature was then scaled and panned into position. In order to achieve a realistic look, the sill was color correct by first desaturating the image and then adding a slight warm tone back with a Compress node. The bottom part of the sill was created by rotoscoping the left part of the window, rotating the image 90 degrees, scaling it to the width of the project, and finally color correcting the result.
The sparkle animation was created with a Motion Magic Dust particle emitter. The greenscreen talent was imported as a 720x486 project. A motion tracker was added to the screen with the index finger as the tracking point. Since the finger tip and the body had similar image characteristics, it was impossible to get a automatic track for most of the movement, so manual tracking was used. The particle emitter started at what appears to the point where she touches the screen and the emitter birth rate was set to zero 12 frame from the end so that it has time to die out.