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?
>>>
>>>> _______________________________________________
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>>>> [email protected], http://forums.thefoundry.co.uk/
>>>> http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users
>>>
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>>>
>>
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