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Blur/widen a key
Hi folk,
I am trying to get more out of the node tree but i am stuck somehow.
Lets say I want to desaturate an object that is totally green and easy to key.
After pulling the key i am increasing the blur amount to 100%.
Which generates a nice halo around it which i want in the end.
The thing is, the object is sometimes far away, sometimes very close.
So somehow I need to extend the key that makes that glow.
I am trying to feed the output of the key into another node to use its blur sliders on top, but somehow it only blurs the RGB, not the A channel.
Does anyone have a nice tip how to widen that key ?A slice of color…
DaVinci 8.0.1 OSX 10.7
MacPro 5.1 2×2,4 24GB
RAID0 8TB eSata 6TB
GTX 470 / GT 120
Extreme 3D+ WAVE -
3 Replies
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There’s an inobvious way of doing this:
1) Add a second serial node, and connect the key output of the prev node to the key input of this one.
1b) Alternately, use the “Add Outside Node” command to do the same thing.2) Open the Key tab, and in the “External Key” section, uncheck “Invert,” and raise the Blur Radius parameter.
That will blur the key some more, without affecting RGB. Unfortunately, the External Key / Blur Radius slider also has a maximum level, so depending on how much blur you want, you may need to do this a few times. It’d be nice if DaVinci raised the maximum levels on blurs.
http://www.alexisvanhurkman.com | http://www.correctionforcolor.com
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Oh yeah, that actually works as expected .
Thanks for the tip Alexis 🙂
My only problem is , its actually eating in to the blur too, so its not widen the key, but soften it only.
Offset seams to go directly to the color values too.
So yeah, it would be nice if they would add some Grow/Shrink options to a already defined key that works kinda like the inner and outer softness mask.A slice of color…
DaVinci 8.0.1 OSX 10.7
MacPro 5.1 2×2,4 24GB
RAID0 8TB eSata 6TB
GTX 470 / GT 120
Extreme 3D+ WAVE -
Can you qualify the surrounding area of the green object by widening the qualifiers and then binding it all into a matte if need be? You could then track it and soften the edges to taste.
Dave Pickett
Colorist
Jam Edit – Atlanta
http://www.jamedit.com
http://www.davepickett.com
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