Chroma-Keying

March 1, 2016

Watched Tango by Zbigniew Rybczynski, 1980

Video express suites are all over campus to do green screen work. Bring in PowerPoint of background to see real time view of yourself.

Watched Peter Campus, Three Transitions, 1973

Hermine Freed, Art Herstory, 1974

·      How to light for our green screen?

·      The Green screen should be flat and the same color through out. Need hardly any shadows on the green screen.

·      The more even the screen is the better.

·      Add new item

o   Move video to V2

o   Replace the V1 with background

o   Unlink if moving horizontally, not vertically

o   Unlink to change or remove audio layer

o   If background is a still image you can extend it to the length of the pairing video

o   Change speed duration for still images, default is usually present.

·      Double arrow in project window

o   Click effects

§  Search Ultra Key

§  Can handle not so nice backgrounds

§  Drag and Drop to the Video with the green screen

·      Not quite there yet

·      Double click project we dragged and dropped it too

·      Effect controls

o   Find Ultra Key after applying it

o   Define Key color

§  Click eye dropper (Samples 1 pixel)

§  Sample in darkest area in program window

§  Command eyedropper samples 5 pixels

o   Ultra Key

§  Output

·      Alpha Channel

·      Shows you the problems you need to fix

·      Goal is black background and white figure

o   Matte Generation

§  Highlight

·      Set to 0 and it already fixes lots of the highlight issues

§  Transparency

·      Up is more definition but is not good

·      Make figure white by going down

§  Pedestal

·      Up blackens the background

§  Sample in the working window to see if it is working throughout the footage

§  Compression Artifacts my be present.

§  Fine tune static

·      Matte Cleanup

o   Zoom in with percentage

o   Choke

§  Bring up to refine pixels

o   Soften

§  Blurs and softens the edges

·      Spill Suppression

o   Effects in project window

§  Crop

§  Drag and drop to video you want it for

§  Define in Effect Controls in Source window

§  If it has a stopwatch you can animate it

o   Effect Controls in Source window

§  Motion

·      Scale to resize image

·      You can also double click and the blue window goes around the image in the Program screen and you can scale and move there.

March 1, 2016