afx-nuke-gizmos/AFXSoftClip.gizmo at master · CreativeLyons/afx-nuke-gizmos · GitHub

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#! /usr/local/Nuke10.5v1/libnuke-10.5.1.so -nx

# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
#
# Copyright (C) 2012-2017, Ryan P. Wilson
#
#      Authority FX, Inc.
#      www.authorityfx.com

# Algorithms from https://github.com/AuthorityFX/afx-nuke-plugins/blob/master/src/afx_soft_clip.cpp

version 10.5 v1
Gizmo {
 inputs 2
 addUserKnob {20 AFXSoftClip}
 addUserKnob {41 clip l Clip T Ctrls.clip}
 addUserKnob {41 knee l Knee T Ctrls.knee}
 addUserKnob {41 metric l Metric T Ctrls.metric}
 addUserKnob {41 red l Red -STARTLINE T Ctrls.red}
 addUserKnob {41 green l Green -STARTLINE T Ctrls.green}
 addUserKnob {41 blue l Blue -STARTLINE T Ctrls.blue}
 addUserKnob {41 alpha l Alpha -STARTLINE T Ctrls.alpha}
}
 Input {
  inputs 0
  name mask
  xpos 323
  ypos -292
  number 1
 }
 Dot {
  name Dot1
  xpos 356
  ypos -115
 }
 Input {
  inputs 0
  name Input
  xpos 50
  ypos -289
 }
 Dot {
  name Dot2
  xpos 83
  ypos -205
 }
set N1aec90f0 [stack 0]
 Expression {
  inputs 1+1
  temp_name0 luma
  temp_expr0 "0.3*r + 0.59*g + 0.11*b"
  temp_name1 lightness
  temp_expr1 "pow(0.2126*r + 0.7152*g + 0.0722*b, 1/3)"
  temp_name2 metric
  temp_expr2 "Ctrls.metric == 0 ? max(r, g, b) : Ctrls.metric == 1 ? luma : lightness"
  temp_name3 scale
  temp_expr3 "Ctrls.clip * pow(tanh(pow(metric / Ctrls.clip, Ctrls.knee)), 1.0 / Ctrls.knee) / max(metric, 0.000001)"
  expr0 "Ctrls.red && metric > 0 ? r * scale : r"
  expr1 "Ctrls.green && metric > 0 ? g * scale : g"
  expr2 "Ctrls.blue && metric > 0 ? b * scale : b"
  channel3 alpha
  expr3 "Ctrls.alpha && a > 0 ? Ctrls.clip * pow(tanh(pow(a / Ctrls.clip, Ctrls.knee)), 1.0 / Ctrls.knee) : a"
  name soft_clip1
  xpos 50
  ypos -119
 }
 Output {
  name Output1
  xpos 50
  ypos -23
 }
push $N1aec90f0
 NoOp {
  name Ctrls
  xpos 183
  ypos -209
  addUserKnob {20 Controls}
  addUserKnob {7 clip l Clip R 0 10}
  clip 5
  addUserKnob {7 knee l Knee}
  knee 0.5
  addUserKnob {4 metric l Metric M {Value Luminance Lightness ""}}
  metric Lightness
  addUserKnob {6 red l Red -STARTLINE}
  red true
  addUserKnob {6 green l Green -STARTLINE}
  green true
  addUserKnob {6 blue l Blue -STARTLINE}
  blue true
  addUserKnob {6 alpha l Alpha -STARTLINE}
 }
end_group