By the way, I ran out of time so I didn't complete my Hue & Sat tool. When I get a moment I'll get back to it and post a v02 on Nukepedia.
Cheers, Ron Ganbar email: [email protected] tel: +44 (0)7968 007 309 [UK] +972 (0)54 255 9765 [Israel] url: http://ronganbar.wordpress.com/ On 5 August 2012 17:25, Martin Constable <[email protected]> wrote: > 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 <[email protected]> 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: [email protected] > 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 <[email protected]> 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 >> > [email protected], http://forums.thefoundry.co.uk/ >> > http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users >> >> _______________________________________________ >> Nuke-users mailing list >> [email protected], http://forums.thefoundry.co.uk/ >> http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users >> > > _______________________________________________ > Nuke-users mailing list > [email protected], http://forums.thefoundry.co.uk/ > http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users > > > _______________________________________________ > Nuke-users mailing list > [email protected], http://forums.thefoundry.co.uk/ > http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users >
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