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Download Nuke 5.1v5 User Guide
Transcript
NUKE That’s completely terrible. What happened? The alpha channel created by the greenscreen keyer must be multiplied into the pixel values of the original image in order to generate the matte. Some keyers, like Primatte, provide a "composite" output option which handles the multiplication for you. The Keyer node does not, so you'll have to do it manually. 8. Select the greenscreen keyer node and choose Merge > Premult from the right-click menu. 9. Adjust the high and low ranges values in the greenscreen node’s control panel to refine the edges around your subject. This keyer isn’t particularly good at handling spill, so let’s add a colour-correction node to remove those green edges. 10. Select the Premult1 node and then choose Colour > HueCorrect from the right-click menu. 509
