set cut_paste_input [stack 0]
push $cut_paste_input
Group {
 name Tonemap_Siragusano
 label "Siragusano \nDecoupled White Pivoted Toe + Surround"
 addUserKnob {20 Tonemap}
 addUserKnob {78 g l grey t "input -> output grey" n 2}
 g {0.18 0.1}
 addUserKnob {78 w l white t "input -> output white" n 2}
 w {16 1}
 addUserKnob {7 p l contrast R 0.8 2}
 p 1.2
 addUserKnob {7 ps l surround t "surround compensation: un-pivoted power function" R 0.8 1.2}
 ps 1
 addUserKnob {7 t0 l toe R 0 0.1}
 t0 0.004
 addUserKnob {78 s l scale n 2}
 s {{(g.0*w.0*(pow(g.1/w.1,1/p)-1))/(g.0-w.0*(pow(g.1/w.1,1/p)))} {w.1*pow(w.0/(w.0+s.0),-p)}}
 addUserKnob {4 direction M {forward inverse}}
 addUserKnob {26 "" +STARTLINE}
 addUserKnob {26 plot_label l " " T "<style>a:link \{color:#ccc\}</style><a href=\"https://www.desmos.com/calculator/oebobyrccn\">desmos plot</a>"}
}
 Input {
  inputs 0
  name Input
  xpos -40
  ypos -70
 }
set Na3a1bd0 [stack 0]
 Expression {
  expr0 w.1*pow(r/w.1,1/ps)
  expr1 w.1*pow(g/w.1,1/ps)
  expr2 w.1*pow(b/w.1,1/ps)
  name InvSurround
  xpos 70
  ypos 21
 }
 Expression {
  temp_name0 st
  temp_expr0 (w.1+t0)/w.1
  expr0 (r+sqrt(r*(4*st*t0+r)))/(2*st)
  expr1 (g+sqrt(g*(4*st*t0+g)))/(2*st)
  expr2 (b+sqrt(b*(4*st*t0+b)))/(2*st)
  name InvToe
  xpos 70
  ypos 51
 }
 Expression {
  expr0 (s.0*pow(r/s.1,1/p))/(1-pow(r/s.1,1/p))
  expr1 (s.0*pow(g/s.1,1/p))/(1-pow(g/s.1,1/p))
  expr2 (s.0*pow(b/s.1,1/p))/(1-pow(b/s.1,1/p))
  name InvCompress
  xpos 70
  ypos 81
 }
push $Na3a1bd0
 Expression {
  expr0 s.1*pow(r/(r+s.0),p)
  expr1 s.1*pow(g/(g+s.0),p)
  expr2 s.1*pow(b/(b+s.0),p)
  name Compress
  xpos -150
  ypos 21
 }
 Expression {
  temp_name0 st
  temp_expr0 (w.1+t0)/w.1
  expr0 (st*r*r)/(r+t0)
  expr1 (st*g*g)/(g+t0)
  expr2 (st*b*b)/(b+t0)
  name Toe
  xpos -150
  ypos 51
 }
 Expression {
  expr0 w.1*pow(r/w.1,ps)
  expr1 w.1*pow(g/w.1,ps)
  expr2 w.1*pow(b/w.1,ps)
  name Surround
  xpos -150
  ypos 81
 }
 Switch {
  inputs 2
  which {{parent.direction}}
  name SwitchDirection
  xpos -40
  ypos 141
 }
 Output {
  name Output
  xpos -40
  ypos 200
 }
end_group