Term 2 – Assignment 2 | 008 Rotoscoping & Green Screen

Plan Plan Plan your scenes before you shoot them to avoid having to rotoscope too much.

Rotoscoping is an animation technique in which animators trace over live-action film movement, frame by frame, for use in animated films. Originally, recorded live-action film images were projected onto a frosted glass panel and re-drawn by an animator. This projection equipment is called a rotoscope, although this device has been replaced by computers in recent years. In the visual effects industry, the term rotoscoping refers to the technique of manually creating a matte for an element on a live-action plate so it may be composited over another background.

  1. Start in the middle of the section with a clean NATURAL pose
  2. Mask off the seaction using the pen tool, Set keyframe for the MASKPATH
  3. Turn to mask off so you can see the movement
  4. Goto the start and rearrange the points you drew for the mask around the new shape KEEPING THE ANCOR POINTS RELATIVE to their position on your 1st shape
  5. Watch the animation play and watch for any xtreme differences between the poses.
  6. If any exteme differences add a new keyframe and more the anchor points into their correct position.
  7. Repeat untill it is aligned properly

Green Screen

Chroma key compositing (or chroma keying) is a technique for compositing (layering) two images together. A color range in the top layer is made transparent, revealing another image behind. The chroma keying technique is commonly used in video production and post-production. This technique is also referred to as color keying, color-separation overlay (CSO; primarily by the BBC), greenscreen, and bluescreen. It is commonly used for weather forecast broadcasts, wherein the news presenter appears to be standing in front of a large map during live television newscasts, but in a television studio it is actually a large blue or green background. The meteorologist stands in front of a bluescreen, and then different weather maps are added on those parts in the image where the color is blue. If the meteorologist wears blue clothes, his clothes will be replaced with the background video. This also works for greenscreens, since blue and green are considered the colors least like skin tone.This technique is also used in the entertainment industry, for example for special effects. Software is available today, such as Pinnacle Studio, which makes it possible and relatively easy for the average home computer user, to create videos using the Chromakey function and greenscreeens.

  • Make sure the screen does NOT clash with anything that you want to greenscreen, otherwise parts of it will be effected by the process and appears transparent
  • Film the green screen on the correct place to allow for the same lighting
  • IRON the sheet, creases or marks will effects how effective the process is
  • avoid natural light if pos and can have an uneven colour

We used Keylight 123 in aftereffects to achieve the green screen. it was very simples and had some options to tweek. But basicely you just sample the color you want to remove (green screen) and it is done.

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