Regarding a Nuke equivalent of a Gradient Map... This is not trivial. A gradient map takes the grey scale values of an image and re-maps them to the color channel. This can be done in a simple way in the following manner (from memory):
1 colorspace convert to HSV 2 using shuffle, replace the H channel with the L channel. 3 using shuffle, replace the S channel with a white. 4 using shuffle, replace the L channel with a mid grey. 5 colorspace convert back to RGB. This will do a straight lightness to full spectrum re-map. Arbitrary changes can then be made using lookups on the lightness channel after. This is clunky. Sure some code monkey can come up with something more elegant. Martin On 5 Aug, 2012, at 10:05 PM, Ron Ganbar <ron...@gmail.com> wrote: > Indeed. What Joe said is spot on. > If you use that "psd layers" button in the Read node you can see all the > options there and learn from it. > > > Ron Ganbar > email: ron...@gmail.com > tel: +44 (0)7968 007 309 [UK] > +972 (0)54 255 9765 [Israel] > url: http://ronganbar.wordpress.com/ > > > > On 5 August 2012 16:03, Joe Laude <loudn...@gmail.com> wrote: > 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? > > _______________________________________________ > > Nuke-users mailing list > > Nuke-users@support.thefoundry.co.uk, http://forums.thefoundry.co.uk/ > > http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users > > _______________________________________________ > Nuke-users mailing list > Nuke-users@support.thefoundry.co.uk, http://forums.thefoundry.co.uk/ > http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users > > _______________________________________________ > Nuke-users mailing list > Nuke-users@support.thefoundry.co.uk, http://forums.thefoundry.co.uk/ > http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users
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