why would you have negative  RGB values in a linear pipe? 

there are many Nuke nodes that will clip at 0, especially mergers. I think you 
need to take a look at what your colour conversion to linear is doing. 

the only time I would expect to see negative values would be in secondary 
channels like pWorld or maybe zDepth and generally speaking the only thing I 
would use a grade node for is to maybe normalise depth.  


-----------------------
Tahl Niran
vfx compositor
www.tahlniran.com



Date: Thu, 21 Apr 2011 11:19:15 -0400
Subject: Re: [Nuke-users] Grade clamping
From: [email protected]
To: [email protected]

the reason is in alpha channel - matte. 


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