Download - Digital Compositing
![Page 1: Digital Compositing](https://reader036.vdocuments.site/reader036/viewer/2022081514/56814c5d550346895db97d2d/html5/thumbnails/1.jpg)
Digital Compositing
CPSC 404/604Donald House
9/22/11
![Page 2: Digital Compositing](https://reader036.vdocuments.site/reader036/viewer/2022081514/56814c5d550346895db97d2d/html5/thumbnails/2.jpg)
A typical compositing operation
+
=over
![Page 3: Digital Compositing](https://reader036.vdocuments.site/reader036/viewer/2022081514/56814c5d550346895db97d2d/html5/thumbnails/3.jpg)
Creating a luma mask
depends on high contrast with image background
Greyscale image Luma level 010 Luma level 040
![Page 4: Digital Compositing](https://reader036.vdocuments.site/reader036/viewer/2022081514/56814c5d550346895db97d2d/html5/thumbnails/4.jpg)
Shooting the foreground against a blue screen
![Page 5: Digital Compositing](https://reader036.vdocuments.site/reader036/viewer/2022081514/56814c5d550346895db97d2d/html5/thumbnails/5.jpg)
Or a green screen
![Page 6: Digital Compositing](https://reader036.vdocuments.site/reader036/viewer/2022081514/56814c5d550346895db97d2d/html5/thumbnails/6.jpg)
Foreground shot for chroma keying
![Page 7: Digital Compositing](https://reader036.vdocuments.site/reader036/viewer/2022081514/56814c5d550346895db97d2d/html5/thumbnails/7.jpg)
“Pulling” an Alpha Mask
Chroma keying – color match too wide
Fuzziness = 9 Fuzziness = 45 Fuzziness = 120
![Page 8: Digital Compositing](https://reader036.vdocuments.site/reader036/viewer/2022081514/56814c5d550346895db97d2d/html5/thumbnails/8.jpg)
First use a “garbage” maskFuzziness = 40
Chroma keying – color match narrower
![Page 9: Digital Compositing](https://reader036.vdocuments.site/reader036/viewer/2022081514/56814c5d550346895db97d2d/html5/thumbnails/9.jpg)
Associated color image
RGB
![Page 10: Digital Compositing](https://reader036.vdocuments.site/reader036/viewer/2022081514/56814c5d550346895db97d2d/html5/thumbnails/10.jpg)
Smoothing to improve mask
![Page 11: Digital Compositing](https://reader036.vdocuments.site/reader036/viewer/2022081514/56814c5d550346895db97d2d/html5/thumbnails/11.jpg)
Smoothing to improve mask
![Page 12: Digital Compositing](https://reader036.vdocuments.site/reader036/viewer/2022081514/56814c5d550346895db97d2d/html5/thumbnails/12.jpg)
Suppressing “blue spill”
B = min(R, G, B)
![Page 13: Digital Compositing](https://reader036.vdocuments.site/reader036/viewer/2022081514/56814c5d550346895db97d2d/html5/thumbnails/13.jpg)
Final compositing operation
+
=over
![Page 14: Digital Compositing](https://reader036.vdocuments.site/reader036/viewer/2022081514/56814c5d550346895db97d2d/html5/thumbnails/14.jpg)
Difference mattes
Clean plate Difference matte
Plate with object
![Page 15: Digital Compositing](https://reader036.vdocuments.site/reader036/viewer/2022081514/56814c5d550346895db97d2d/html5/thumbnails/15.jpg)
Difference mattes
Matte used for compositingMatte applied to original plate
![Page 16: Digital Compositing](https://reader036.vdocuments.site/reader036/viewer/2022081514/56814c5d550346895db97d2d/html5/thumbnails/16.jpg)
End