I don't know the HSV tool very well. Always understood it as Photoshop's Hue Sat adjustment on steroids.
But... as far as I am aware the HSV tool can: - Replace hue - Cycle the hue values As with the 'perform contrast adjustment on the H channel' method, it is difficult to stop the effect spilling over into neighbouring hues. Functionally, it seems simply to take one hue value and replace it with another. The docs are a bit zen on the exact function of the range slider parameter, but it seems to spread the source color range. Our tool does something like this: It takes a user defined contiguous selection of the hue histogram and stretches (or compresses) it. I have compared the two results using the Vector Scope and the effects are clearly different, though I admit that currently our approach can produce 'gappy' histograms (I am assured that this is solvable). Thanks for the feedback Diogo! These are very useful comments. On 10 Jun, 2014, at 11:47 AM, Diogo Girondi <[email protected]> wrote: > Perhaps I'm missing something, but isn't that what the HSVTool does? > > > cheers, > Diogo > > > On Mon, Jun 9, 2014 at 12:16 PM, Elias Ericsson Rydberg > <[email protected]> wrote: > You could do a key on a specified range of hues using the keyer, using that > as a mask for a grade node. That node manipulates the red(rgb->hsv first) > would probably give you the results you're looking for? > > Don't have nuke in front of me but I think that could work. > > Best regards, > Elias Ericsson Rydberg > > måndag 9 juni 2014 skrev Martin Constable <[email protected]>: > > Thats a good idea and actually something I already tried. > > After some fiddling similar results can be had. And the results themselves > are sometime comparable. > > However, it is very difficult to control and the effects is very likely to > spill over into other color values. Drawing an adjustment in ColorLookup can > offer more local control but is even more difficult to master. > > > > On 9 Jun, 2014, at 5:22 PM, Adrian Cruceru <[email protected]> wrote: > > > Try this: > > > > Use a colorspace node to change the current color space from linear to HSV > > then use a grade node to color correct just the red channel (which becomes > > the Hue chanel after the colorspace node) then use a second colorspace to > > get the colors back into the linear color space > > > > Any color correction applied to the red channel between the two colorspace > > nodes will only alter the hue, so you cna compress it and change it as you > > want > > > > Hope it helps > > > > Cheers > > > > Adrian > > > > > > On Mon, Jun 9, 2014 at 10:01 AM, Martin Constable <[email protected]> > > wrote: > > Unforgivably I accidentally deleted the questions from the source file. > > > > They are: > > The questions must have got accidentally deleted. They are simple: > > - Can such an effect be easily achieved with existing tools? > > - Would you find such a tool useful? > > > > Apologies > > > > > > On 9 Jun, 2014, at 3:44 PM, Martin Constable <[email protected]> wrote: > > > > > Dear Nuke users, > > > > > > > > > I am writing to you in order to ask for your help on a research project > > > that I am engaged in with here at Nanyang Technological University. I > > > hope you won't regard this as spam. > > > > > > I am working with some engineers on a tool whereby the local hue contrast > > > of a region may be expanded or compressed. Exactly what we mean by this > > > will take a bit of explanation which I hope is delivered in the linked > > > pdf. > > > > > > We are now hoping to publish and are looking for feedback from > > > professionals as to the usefulness and novelty of our approach. Ideally, > > > we would like people who have a special interest in color. > > > > > > A very short description is here, as is two questions we would like to > > > ask: > > > https://dl.dropboxusercontent.com/u/3788380/HUE_TOOL_FEEDBACK.pdf > > > > > > We are working to a tight schedule (deadline = this Friday 13th) and do > > > not have time for a full user study. However, one or two lines of > > > feedback will be very helpful, especially from users of your caliber. > > > > > > I thank you all sincerely in advance > > > > > > Martin Constable > > > > > > > > > > > > CONSTABLE Martin | School of Art Design and Media | Nanyang Technological > > > University > > > 3-21, 81 Nanyang Drive, Singapore 637458 > > > Tel: (65) 6316-8729 GMT+8h | HP: (65) 9329-4064 | Fax: (65) 6795-3140 | > > > Email: [email protected] > > > > > > > > > > > > _______________________________________________ > > > 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 > > > > > > > > -- > > Adrian Cruceru > > df(x) > > _______________________________________________ > > 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
