The difference between how nuke and photoshop most likely has to do with the colorspace it is done in(scene linear vs srgb or lab). Try doing this in other colorspaces in Nuke and converting it back.
On Sat, Apr 8, 2017 at 9:02 AM, Stepan Z <[email protected]> wrote: > Hello Howard > > Thanks for doublechecking, thats what i found as-well! I think selective > colour on relative in photoshop just does something completely different. > I'll keep playing around with it and see what i find! > > Thanks for your help! > > All the best > > Stepan > > On 6 Apr 2017, at 19:44, Howard Jones <[email protected]> wrote: > > Hi Stepan > > Had a chance to have a look at the regrading is done like this > > The image is split into its Primaries, secondaries and tertiaries and > these create mattes. > > These mattes are then multiplied by the colour - so from this I would > think that this already is a relative grade as, for example only 50% red is > applied to a 50% matte. > > Cheers > > *Howard **Jones* > Visual Effects Supervisor > m: 07973 265624 | e: [email protected] | w: www.axis-vfx.com > > On 1 Apr 2017, at 19:30, Howard Jones <[email protected]> wrote: > > The main area is quite simple, once the image has been split up into its > primaries, secondaries and tertiaries, you have a set of mattes which are > coloured back to the original colour. This is done with an offset from > memory. This is already multiplied by the matte so it may already be > relative. Not sure. > > If not it may be a case of multiplying a constant by the matte. However I > think I used to do that and it didn't handle values greater than 1. > > Anyway at the moment I haven't worked out how to do this without an > expression node, which maybe the answer anyway. > > Howard > > On 31 Mar 2017, at 5:50 pm, Howard Jones <[email protected]> wrote: > > Ok > Send anything back please and I can update the tool. > > Howard > > On 31 Mar 2017, at 5:34 pm, motion artist <[email protected]> wrote: > > Thanks Howard! I'll experiment and see what I manage to come up with! > > All the best > > Stepan > > On Thu, Mar 30, 2017 at 5:53 PM, Howard Jones <[email protected]> wrote: > >> Found this, I’d have to have a think but don’t wait up for it. >> >> https://www.dpreview.com/forums/post/26485128 >> >> Relative - Changes the existing amount of cyan, magenta, yellow, or black >> by its percentage of the total. For example, if you start with a pixel that >> is 50% magenta and add 10%, 5% is added to the magenta (10% of 50% = 5%) >> for a total of 55% magenta. (This option cannot adjust pure specular white, >> which contains no color components.) >> >> Absolute - Adjusts the color in absolute values. For example, if you >> start with a pixel that is 50% magenta and add 10%, the magenta ink is set >> to a total of 60%. >> >> Note: The adjustment is based on how close a color is to one of the >> options in the Colors menu. For example, 50% magenta is midway between >> white and pure magenta and receives a proportionate mix of corrections >> defined for the two colors. >> >> >> *Howard **Jones* >> Visual Effects Supervisor >> m: 07973 265624 | e: [email protected] | w: www.axis-vfx.com >> >> On 30 Mar 2017, at 16:54, motion artist <[email protected]> wrote: >> >> Hello again >> >> So the Secondary Colour works a treat, but I was wondering how to >> implement the Relative vs Absolute option that the PS selective colour has >> in Nuke. It doesn't seem like anyone from the photoshop community knows >> exactly how this works. Has anybody tried reverse engineering that? >> >> Appreciate all the help >> >> All the best >> >> Stepan >> _______________________________________________ >> Nuke-users mailing list >> [email protected], http://forums.thefoundry.co.uk/ >> http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users >> >> >> >> >> *A X I S V F X* >> The Bottle Yard Studios >> Whitchurch Lane >> Bristol BS14 0BH >> >> >> axis-vfx.com >> >> _______________________________________________ >> 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 > > > > > *A X I S V F X* > > The Bottle Yard Studios > > Whitchurch Lane > > Bristol BS14 0BH > > > > axis-vfx.com > > _______________________________________________ > 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
