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Digital Compositing

CPSC 404/604 Donald House 9/22/11. Digital Compositing. A typical compositing operation. +. over. =. Creating a luma mask. Greyscale image. Luma level 010. Luma level 040. depends on high contrast with image background. Shooting the foreground against a blue screen.

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Digital Compositing

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  1. CPSC 404/604 Donald House 9/22/11 Digital Compositing

  2. A typical compositing operation + over =

  3. Creating a luma mask Greyscale image Luma level 010 Luma level 040 depends on high contrast with image background

  4. Shooting the foreground against a blue screen

  5. Or a green screen

  6. Foreground shot for chroma keying

  7. “Pulling” an Alpha Mask Fuzziness = 9 Fuzziness = 45 Fuzziness = 120 Chroma keying – color match too wide

  8. First use a “garbage” mask Fuzziness = 40 Chroma keying – color match narrower

  9. Associated color image RGB a

  10. Smoothing to improve mask

  11. Smoothing to improve mask

  12. Suppressing “blue spill” B = min(R, G, B)

  13. Final compositing operation + over =

  14. Difference mattes Plate with object Clean plate Difference matte

  15. Difference mattes Matte applied to original plate Matte used for compositing

  16. End

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