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: how...@axis-vfx.com | w: www.axis-vfx.com > On 1 Apr 2017, at 19:30, Howard Jones <how...@axis-vfx.com> 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 <how...@axis-vfx.com > <mailto:how...@axis-vfx.com>> wrote: > >> Ok >> Send anything back please and I can update the tool. >> >> Howard >> >> On 31 Mar 2017, at 5:34 pm, motion artist <motionarti...@gmail.com >> <mailto:motionarti...@gmail.com>> 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 <how...@axis-vfx.com >>> <mailto:how...@axis-vfx.com>> wrote: >>> Found this, I’d have to have a think but don’t wait up for it. >>> >>> https://www.dpreview.com/forums/post/26485128 >>> <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: how...@axis-vfx.com <mailto:how...@axis-vfx.com> | w: >>> www.axis-vfx.com <http://www.axis-vfx.com/> >>>> On 30 Mar 2017, at 16:54, motion artist <motionarti...@gmail.com >>>> <mailto:motionarti...@gmail.com>> 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 >>>> Nuke-users@support.thefoundry.co.uk >>>> <mailto:Nuke-users@support.thefoundry.co.uk>, >>>> http://forums.thefoundry.co.uk/ <http://forums.thefoundry.co.uk/> >>>> http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users >>>> <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 <http://axis-vfx.com/> >>> _______________________________________________ >>> Nuke-users mailing list >>> Nuke-users@support.thefoundry.co.uk >>> <mailto:Nuke-users@support.thefoundry.co.uk>, >>> http://forums.thefoundry.co.uk/ <http://forums.thefoundry.co.uk/> >>> http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users >>> <http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users> >>> >>> _______________________________________________ >>> Nuke-users mailing list >>> Nuke-users@support.thefoundry.co.uk >>> <mailto:Nuke-users@support.thefoundry.co.uk>, >>> http://forums.thefoundry.co.uk/ <http://forums.thefoundry.co.uk/> >>> http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users >>> <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
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