You can make it a little more lively like this:
set cut_paste_input [stack 0]
version 6.3 v8
push $cut_paste_input
Group {
name GradientMap
selected true
xpos 419
ypos -163
addUserKnob {20 User}
addUserKnob {7 hueRange R 0 5}
hueRange 0.5
addUserKnob {7 rotateHue R -180 180}
addUserKnob {41 color l value T Constant1.color}
}
Constant {
inputs 0
color 1
name Constant1
xpos 240
ypos 322
}
Input {
inputs 0
name Input1
xpos 372
ypos 166
}
Colorspace {
colorspace_out HSV
name Colorspace1
xpos 372
ypos 206
}
Shuffle {
red blue
green white
name Shuffle1
label "\[value in] > \[value out]\n\[value in2] > \[value out2]"
xpos 372
ypos 263
}
ShuffleCopy {
inputs 2
blue blue
name ShuffleCopy1
label "\[value in] | \[value out]"
xpos 372
ypos 341
}
Ramp {
output {rgba.red -rgba.green -rgba.blue}
replace true
p0 {100 0}
p1 {100 1556}
name Ramp1
xpos 372
ypos 375
}
Grade {
channels {rgba.red -rgba.green -rgba.blue}
white {{parent.hueRange}}
add {{parent.rotateHue/360}}
black_clamp false
name Grade1
xpos 372
ypos 409
}
Colorspace {
colorspace_in HSV
name Colorspace3
xpos 371
ypos 465
}
Output {
name Output1
xpos 371
ypos 561
}
end_group
Ron Ganbar
email: [email protected]
tel: +44 (0)7968 007 309 [UK]
+972 (0)54 255 9765 [Israel]
url: http://ronganbar.wordpress.com/
On 9 August 2012 19:47, Howard Jones <[email protected]> wrote:
> You mean like below?
> I've hardly ever used this - what's it used for?
>
> Howard
>
>
> set cut_paste_input [stack 0]
> version 6.3 v8
> push $cut_paste_input
> Group {
> name GradientMap
> selected true
> xpos 1061
> ypos 87
> addUserKnob {20 User}
> addUserKnob {41 color l value T Constant1.color}
> }
> Constant {
> inputs 0
> channels rgba
> color 0.5
> name Constant1
> xpos 238
> ypos 358
>
> }
> Input {
> inputs 0
> name Input1
> xpos 372
> ypos 166
>
> }
> Colorspace {
> colorspace_out HSV
> name Colorspace1
> xpos 372
> ypos 206
> }
> Shuffle {
> red blue
> green white
> name Shuffle1
>
> label "\[value in] > \[value out]\n\[value in2] > \[value out2]"
> xpos 379
> ypos 259
> }
> ShuffleCopy {
> inputs 2
> blue blue
> name ShuffleCopy1
>
> label "\[value in] | \[value out]"
> xpos 379
> ypos 369
> }
> Colorspace {
> colorspace_in HSV
> name Colorspace3
> selected true
> xpos 371
> ypos 465
> }
> Output {
> name Output1
> xpos 371
> ypos 561
> }
> end_group
>
>
> ------------------------------
> *From:* Martin Constable <[email protected]>
>
> *To:* Nuke user discussion <[email protected]>
> *Cc:* Nuke user discussion <[email protected]>
> *Sent:* Sunday, 5 August 2012, 15:25
>
> *Subject:* Re: [Nuke-users] Re: Photoshop equivilents
>
> 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
>
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