Keying - Nuke 101: Professional Compositing and Visual Effects - page 311

Your cursor is now to the right of the 0 you just entered. Using the Up and Down
Arrow keys, you can now nudge the value in hundredths.
9. Decrease the value by pressing the Down Arrow key slowly. You are looking for
the magic value that will not bring in too much black into the green area, but will
still reduce the amount of hairs visible on the edge of the black patch. Nudge the
value down to −0.05 ( FIGURE 7.16 ).
Figure 7.16. Having all those black holes around the edges of the image is
not good.
You have actually gone too far. You should not have these black holes around the
edges. A few will be OK, but not big patches. You need to go back a little.
10. Iendedupmovingthecursoragaintotherightandaddinganotherdigit(thethou-
sandth) and my final value is −0.035. Anything else started producing blacks at
the bottom-right corner. Find your magic value.
You should now do the same with the Darks property. Slowly bring it down. But
I tried it already. Moving it even by 0.001 will bring in unwanted black patches.
So leave it as it is.
The next property to adjust is the Erode property. This will eat in further from the
blackpatchandreducetheamountofhairdetailyouhave.Itmightalsointroduce
some unwanted black patches, so be careful.
11. Start dragging the slider to increase the Erode property value. It's OK to let a few
little black patches appear, but not too much. I left mine at 1.5 ( FIGURE 7.17 ).
Figure 7.17. The result so far.