There is a soft-light merge operation in the merge node, but what's probably 
throwing you off is that, when merging Photoshop layers in Nuke, you need to 
use the Video Colorspace checkbox next to the merge mode pulldown. Nuke's merge 
math uses linear color values, but Photoshop's uses sRGB. The Video Colorspace 
checkbox will change the incoming images to sRGB (or whatever your 8-bit 
setting is in project settings), perform the merge operation and change the 
output back to linear for you. That'll match your results in Photoshop much 
better.

Note that this is not just for soft-light. All merge operations will behave 
differently in Nuke from what Photoshop does because of the different 
colorspaces, so any operation, even just an over, will better match Photoshop 
with Video Colorspace turned on.

On Aug 3, 2012, at 2:31 AM, irwit wrote:

> Thanks for the quick reply Ron. 
> 
> I cannot seem to find "Hue curves"?
> 
> Soft light I'm guessing does not have an equivalent in the merge options 
> then? 
> 
> Finally, a gradient adjustment layer remaps your pixel values based on the 
> gradient, so a blue to yellow gradient would take your image and in the darks 
> map blue and lights map yellow. 
> 
> 
> So in photoshop, I would take my image, apply a curve or something and set 
> the blending mode of that curve to say "multiply". This would multiply the 
> image on itself and apply the curve to the multiplier. 
> 
> In nuke i'm guessing the easiest way to do this is to split the channel with 
> the grade and remerge it with itself?
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