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Foreground Compositing in Nuke

Foreground Compositing in Nuke

1. Background and Foreground Images.

Background : an actual scale, Foreground: 1:4 scale

FG_BG

2. Extract the green channel from the foreground.

Add Grade node : It is easier to extract the green channel.

Use a color picker to get values on the whitepoint and blackpoint on the grade node.

Press this icon and you can grab a color from whatever is in your viewer. Following are so helpful keys commends.

  • Command click in the viewer window to sample a pixel point within it.
  • Command + Option will sample the color from the image before the current operation. If you don’t do this it will sample live from the viewer windows ‘’post adjustment’’.
  • Shift combined with any combination of these key strokes will draw a marquee around a sample area.

Beware: When you have finished with the color picker press it again to disengage it or it will continue to sample.

Fg_grade_node

Fg_grade_para

 3.  Add KeyLight (I called this CoreKlight) node to extract the green channel. Get the screen color value and adjust the tuning.

Screen Shot 2013-11-07 at 10.08.32 PM

core_keylight_image

core_keylight_para

4. Extract the rest of the foreground besides the stair.

Screen Shot 2013-11-07 at 9.02.12 PM

Add Grade, Erode (fast) and blur. For the RotoPaint ->I added a blur node / value 3

Screen Shot 2013-11-07 at 9.10.33 PM

Screen Shot 2013-11-07 at 9.10.49 PM

Screen Shot 2013-11-07 at 9.10.57 PM

Screen Shot 2013-11-07 at 9.11.29 PM

Then connect this to the Edge KeyLight

Screen Shot 2013-11-07 at 9.19.55 PM

Screen Shot 2013-11-07 at 9.57.38 PM

Then add In node – The matte has been created.

Screen Shot 2013-11-07 at 10.17.26 PM

5. Add Key mix to finish.

FG_matte

Screen Shot 2013-11-07 at 10.00.07 PM