COLOR MIX

ColorMix is a tool a Supervisor I had passed me a while back. It is used to give an image the color of another while maintaining the original luminance.

You have to connect Color_In and Luminance_In for it to work. You can also choose the colorspace you want and how much you want it to mix with the original image (the one connected to Color_In)

Expand ColorMix

Group {
 inputs 0
 name ColorMix1
 onCreate "\nif nuke.thisNode()\['f_created'].getValue()==True:\n	nuke.thisNode()\['f_created'].setValue(False)\n	nuke.thisNode().showControlPanel()"
 tile_color 0x263bffff
 label "merge color only"
 selected true
 xpos 208
 ypos -213
 addUserKnob {20 User}
 addUserKnob {41 colorspace_out l colorspace T Colorspace_luma_in.colorspace_out}
 addUserKnob {26 ""}
 addUserKnob {41 mix T Mix.mix}
 addUserKnob {26 ""}
 addUserKnob {41 maskChannelMask l mask -STARTLINE T Mix.maskChannelMask}
 addUserKnob {41 inject -STARTLINE T Mix.inject}
 addUserKnob {41 invert_mask l invert -STARTLINE T Mix.invert_mask}
 addUserKnob {41 fringe -STARTLINE T Mix.fringe}
 addUserKnob {6 f_created l "First Created?" +INVISIBLE +STARTLINE}
 f_created true
}
 Input {
  inputs 0
  name Mask
  xpos 320
  ypos -1
  number 2
 }
 Input {
  inputs 0
  name Luminance_In
  xpos 494
  ypos -270
 }
 Dot {
  name Dot5
  xpos 528
  ypos -175
 }
set N1044ee30 [stack 0]
 Colorspace {
  colorspace_out HSV
  name Colorspace_luma_in
  xpos 686
  ypos -178
 }
set N10454900 [stack 0]
 Input {
  inputs 0
  name Color_In
  xpos 799
  ypos -273
  number 1
 }
 Colorspace {
  channels {{{Colorspace1.channels}}}
  colorspace_in {{Colorspace_luma_in.colorspace_in}}
  illuminant_in {{Colorspace_luma_in.illuminant_in}}
  primary_in {{Colorspace_luma_in.primary_in}}
  colorspace_out {{Colorspace_luma_in.colorspace_out}}
  illuminant_out {{Colorspace_luma_in.illuminant_out}}
  primary_out {{Colorspace_luma_in.primary_out}}
  bradford_matrix {{Colorspace_luma_in.bradford_matrix}}
  maskChannelMask {{{Colorspace1.maskChannelMask}}}
  maskChannelInput {{{Colorspace1.maskChannelInput}}}
  invert_mask {{Colorspace_luma_in.invert_mask}}
  unpremult {{{Colorspace1.unpremult}}}
  invert_unpremult {{Colorspace_luma_in.invert_unpremult}}
  mix {{Colorspace_luma_in.mix}}
  name Colorspace_color_in
  xpos 799
  ypos -178
  bookmark {{Colorspace_luma_in.bookmark}}
 }
set N104723a0 [stack 0]
 Copy {
  inputs 2
  from0 rgba.red
  to0 rgba.red
  name Copy1
  xpos 799
  ypos -86
 }
push $N10454900
push $N104723a0
 Copy {
  inputs 2
  from0 rgba.blue
  to0 rgba.blue
  name Copy3
  selected true
  xpos 694
  ypos -88
 }
 Switch {
  inputs 2
  which {{Colorspace_luma_in.colorspace_out>8?1:0}}
  name Switch1
  xpos 758
  ypos -38
 }
 Colorspace {
  channels {{{Colorspace1.channels}}}
  colorspace_in {{Colorspace_luma_in.colorspace_out}}
  illuminant_in {{Colorspace_luma_in.illuminant_out}}
  primary_in {{Colorspace_luma_in.primary_out}}
  colorspace_out {{Colorspace_luma_in.colorspace_in}}
  illuminant_out {{Colorspace_luma_in.illuminant_in}}
  primary_out {{Colorspace_luma_in.primary_in}}
  name Colorspace_out
  xpos 758
  ypos -5
 }
push $N1044ee30
 Merge2 {
  inputs 2+1
  operation copy
  output {rgba.red rgba.green rgba.blue -rgba.alpha}
  maskChannelMask -rgba.alpha
  name Mix
  xpos 494
  ypos -1
 }
 Output {
  name Output1
  xpos 494
  ypos 100
 }
end_group