Yes we ship it in the NDK examples:
Documentation/NDK/examples/Grade.cpp (Mac, Nuke 8.0v6)
On 10 January 2015 at 16:15, theodor groeneboom <plateryt...@gmail.com>
wrote:
> I believe you can check the source for the grade node in the NDK.
>
> On 10 January 2015 at 15:55, Mads Lund <madshl...@gmail.com> wrote:
>
>> Thanks alot, i can see that now. I guess it was a bit too inconvenient to
>> show the full equation in the node's help info.
>>
>> On Sat, Jan 10, 2015 at 4:38 PM, Joe Laude <loudn...@gmail.com> wrote:
>>
>>> Well I learned something new today, because I didn't actually know that
>>> the grade node did this. The grade node is not telling the whole truth
>>> about the expression in its info.
>>>
>>> I laid out pretty much the same thing (I don't have access to Nuke 8, so
>>> I set up virtually the same thing as yours but using an expression node),
>>> and I discovered that the Grade node doesn't do a straight pow() function
>>> for the gamma above 1 or below 0. It does what you'd expect from 0 to 1,
>>> but above 1, it's not a power curve, but a flat line, with the slope of
>>> whatever the gamma exponent is.
>>>
>>> Below is what I was playing with in nuke. It has the expression node
>>> which does the same as your blinkscript did, and the grade node you had, as
>>> well as an expression node that visualizes the color curve (just view it,
>>> you'll see what I mean. View the "GammaCurve" node, and then connect that
>>> to the other nodes to see what's going on), and finally an expression node
>>> that includes the corrected expression, which uses different expressions
>>> for above 1 and below 0.
>>>
>>> set cut_paste_input [stack 0]
>>> version 7.0 v9
>>> push $cut_paste_input
>>> Ramp {
>>> p0 {0 0}
>>> p1 {2048 0}
>>> color {100 100 100 1}
>>> name Ramp2
>>> selected true
>>> xpos -73
>>> ypos -78
>>> }
>>> Grade {
>>> blackpoint 0.25
>>> black_clamp false
>>> name Grade2
>>> selected true
>>> xpos -73
>>> ypos -40
>>> }
>>> set N3b094970 [stack 0]
>>> Expression {
>>> temp_name0 A
>>> temp_expr0
>>> Grade6.multiply*(Grade6.white-Grade6.black)/(Grade6.whitepoint-Grade6.blackpoint)
>>> temp_name1 B
>>> temp_expr1 Grade6.add+Grade6.lift-A*Grade6.blackpoint
>>> temp_name2 exp
>>> temp_expr2 1/Grade6.gamma
>>> expr0 r<0?A*r+B:r>1?(r-1)*exp+1:pow(A*r+B,exp)
>>> expr1 r<0?A*r+B:r>1?(r-1)*exp+1:pow(A*r+B,exp)
>>> expr2 r<0?A*r+B:r>1?(r-1)*exp+1:pow(A*r+B,exp)
>>> name CorrectedGradeExpression
>>> selected true
>>> xpos 152
>>> ypos 24
>>> }
>>> push $N3b094970
>>> Expression {
>>> temp_name0 A
>>> temp_expr0
>>> Grade6.multiply*(Grade6.white-Grade6.black)/(Grade6.whitepoint-Grade6.blackpoint)
>>> temp_name1 B
>>> temp_expr1 Grade6.add+Grade6.lift-A*Grade6.blackpoint
>>> temp_name2 exp
>>> temp_expr2 1/Grade6.gamma
>>> expr0 pow(A*r+B,exp)
>>> expr1 pow(A*g+B,exp)
>>> expr2 pow(A*b+B,exp)
>>> name UncorrectedGradeExpression
>>> selected true
>>> xpos 20
>>> ypos 23
>>> }
>>> set N3b115410 [stack 0]
>>> Expression {
>>> expr0 floor(r*20)==y-20?1:0
>>> expr1 floor(g*20)==y-20?1:0
>>> expr2 floor(b*20)==y-20?1:0
>>> name GammaCurve
>>> label "Illustrates gamma curve"
>>> selected true
>>> xpos 90
>>> ypos 153
>>> }
>>> push $N3b115410
>>> push $N3b094970
>>> Grade {
>>> gamma 2.3
>>> black_clamp false
>>> name Grade6
>>> selected true
>>> xpos -202
>>> ypos 22
>>> }
>>> Difference {
>>> inputs 2
>>> output rgba.red
>>> name Difference1
>>> selected true
>>> xpos -101
>>> ypos 166
>>> }
>>>
>>>
>>> On Sat, Jan 10, 2015 at 6:04 AM, Mads Lund <madshl...@gmail.com> wrote:
>>>
>>>> Hey Guys.
>>>>
>>>> I find it super convenient that some of the node actually explains how
>>>> they operate, so that you can re-create them in your expressions and blink
>>>> scripts.
>>>> However the equation descriped in the Gradenode does not match the
>>>> actuall output of the node
>>>>
>>>> A = multiply*(gain-lift)/(whitepoint-blackpoint)
>>>>
>>>> B = offset + lift - A*blackpoint
>>>>
>>>> output = pow(A*input+B,1/gamma)
>>>>
>>>>
>>>> Here is a little comparison:
>>>>
>>>>
>>>>
>>>> set cut_paste_input [stack 0]
>>>>
>>>> version 8.0 v4
>>>>
>>>> push $cut_paste_input
>>>>
>>>> Ramp {
>>>>
>>>> p0 {0 408}
>>>>
>>>> p1 {1924 426}
>>>>
>>>> color 10000
>>>>
>>>> name Ramp2
>>>>
>>>> selected true
>>>>
>>>> xpos -2
>>>>
>>>> ypos 379
>>>>
>>>> }
>>>>
>>>> set Ne890edf0 [stack 0]
>>>>
>>>> BlinkScript {
>>>>
>>>> ProgramGroup 1
>>>>
>>>> KernelDescription "1 \"Grade\" iterate componentWise
>>>> 3aed9d965918ead671ab9383439b4816a7772727775caa4b995181fa06c4c03e 2 \"src\"
>>>> Read Point \"dst\" Write Point 0"
>>>>
>>>> kernelSource "kernel Grade :
>>>> ImageComputationKernel<eComponentWise>\n\{\n Image<eRead, eAccessPoint,
>>>> eEdgeClamped> src;\n Image<eWrite> dst;\n void process() \{\n float4
>>>> Colors = src();\n float input = Colors.x;\n float blackpoint =
>>>> 0.0f;\n float whitepoint = 1.0f;\n float lift = 0.0f;\n float gain
>>>> = 0.01f;\n float multiply = 1.0f;\n float offset = 0.0f;\n float
>>>> gamma = 2.0f;\n float A =
>>>> multiply*(gain-lift)/(whitepoint-blackpoint);\n float B = offset + lift
>>>> - A*blackpoint;\n float output = pow(A*input+B,1/gamma);\n dst() =
>>>> output;\n \}\n\};"
>>>>
>>>> rebuild ""
>>>>
>>>> name BlinkScript1
>>>>
>>>> selected true
>>>>
>>>> xpos -86
>>>>
>>>> ypos 423
>>>>
>>>> }
>>>>
>>>> push $Ne890edf0
>>>>
>>>> Grade {
>>>>
>>>> white 0.01
>>>>
>>>> gamma 2
>>>>
>>>> black_clamp false
>>>>
>>>> enable_mix_luminance false
>>>>
>>>> name Grade6
>>>>
>>>> selected true
>>>>
>>>> xpos 78
>>>>
>>>> ypos 431
>>>>
>>>> }
>>>>
>>>> Difference {
>>>>
>>>> inputs 2
>>>>
>>>> output rgba.red
>>>>
>>>> name Difference1
>>>>
>>>> selected true
>>>>
>>>> xpos -12
>>>>
>>>> ypos 494
>>>>
>>>> }
>>>>
>>>>
>>>>
>>>> Am i missing something, and or do you guys know what is missing?
>>>>
>>>>
>>>> _______________________________________________
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>>>>
>>>
>>>
>>>
>>> --
>>> Joe Laude
>>>
>>> _______________________________________________
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>>> Nuke-users@support.thefoundry.co.uk, http://forums.thefoundry.co.uk/
>>> http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users
>>>
>>
>>
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>>
>
>
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--
Frank Harrison
Senior Nuke Software Engineer
The Foundry
Tel: +44 (0)20 7968 6828 - Fax: +44 (0)20 7930 8906
Web: www.thefoundry.co.uk
Email: frank.harri...@thefoundry.co.uk
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