contrast-linear-ocio.expr.nk

set cut_paste_input [stack 0]
version 13.1 v3
push $cut_paste_input
Expression {
 temp_name0 signR
 temp_expr0 "r<0 ? -1 : 1"
 temp_name1 signG
 temp_expr1 "g<0 ? -1 : 1"
 temp_name2 signB
 temp_expr2 "b<0 ? -1 : 1"
 expr0 "pow(abs(r / p),  contrast.r) * p * signR"
 expr1 "pow(abs(g / p),  contrast.g) * p * signG"
 expr2 "pow(abs(b / p),  contrast.b) * p * signB"
 name contrastLinearOcio
 selected true
 xpos -128
 ypos -75
 addUserKnob {20 User}
 addUserKnob {19 contrast R 0 5}
 contrast 1.0
 addUserKnob {7 pivot}
 pivot 0.18
 addUserKnob {7 p t "actual pivot used"}
 p {{"0.18 * pow(2, pivot)"}}
 addUserKnob {20 About}
 addUserKnob {26 toolName l name T OCIOContrastLinear}
 addUserKnob {26 toolVersion l version T 1.0.1}
 addUserKnob {26 toolAuthor l author T "<a style=\"color: rgb(200,200,200);\" href=\"https://mrlixm.github.io/\">Liam Collod</a>"}
 addUserKnob {26 toolDescription l description T "Contrast on linear encoding based on OCIO implementation."}
 addUserKnob {26 toolUrl l url T "<a style=\"color: rgb(200,200,200);\" href=\"https://github.com/MrLixm/Foundry_Nuke\">https://github.com/MrLixm/Foundry_Nuke</a>"}
 addUserKnob {26 toolRef l "Reference" +STARTLINE T "<h2>Formula</h2>\n<p><em>src\\OpenColorIO\\ops\\gradingprimary\\GradingPrimaryOpCPU.cpp#L180</em></p>\n<h2>Pivot</h2>\n<p><em>src\\OpenColorIO\\ops\\gradingprimary\\GradingPrimary.cpp#L194</em></p>"}

}