Keyer Node or Chromakey Node: Colorlookup node tidbit

Here is a NatronNation tidbit,

This is concerning pulling a key using the Keyer Node or Chromakey Node. I have been practicing using the Colorlookup node curves to adjust my keys instead of using the Key Lift & Key Gain when pulling my keys. I find sometimes on certain material you have to crank the acceptance angle higher than I want to and trying to find the best center position in the Keyer node to get that good high contrast matte. Sometime the edges may suffer based on the hue you have to pull.
The Colorlookup node curves offers you more control over crushing your blacks and expanding your white to get that perfect contrast. You can create anchors and pivot points in the curve to limit which range you want to adjust, rather it be shadows, mid-tones or highlights. The attached image shows a very basic screen shot of what it looks like in action.

Key_ColorLookup_Matte

The Key Lift & Key Gain performs great but you don’t have that extra control on the mid tones that may effect your edges. Just remember to insert the Colorlookup node after your keyer/chromakey node and use the Alpha Channel curve to finesse your matte.

P.S. Also use your gamma switch control at the top of the viewer to do a final check and pass on all your keys. This process is called slamming your gamma. Most times to the necked eye we can’t see our mattes properly if our monitors are not calibrated for the right gamma display. This is most useful when using the curves from the ColorLookup node for final adjustments.

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