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Digital Compositing

Learn the art of digital compositing by creating luma masks, pulling alpha masks, and mastering chroma keying techniques for seamless visual effects. Understand the process of creating difference mattes and cleaning plates for professional compositing tasks.

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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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