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Channel Grain

ToolSets / Channel

Channel

2026-09-07

ToolSets/channel/channelGrain.nk

grain

channel

utility

denoise

layers

regrain

View on GitHub

Extracts grain by differencing a plate against a denoise input and packs grain, plate_denoise, and plate_original into layers.

Channel Grain takes two inputs: a plate and a matching denoise pass. It isolates grain as the difference of plate minus denoise.

The denoise stream is stored as a plate_denoise layer. The difference is written to a grain layer and copied onto the plate. A plate_original layer is added, layers are merged through, and alpha is cleared on output.

Use it when you need grain broken out into channels for regrain, grain matching, or other channel-based grain work in a Nuke comp.

Script code

set cut_paste_input [stack 0]
version 12.1 v5
push 0
push $cut_paste_input
Group {
 inputs 2
 name channelGrain
 tile_color 0x421010ff
 selected true
 xpos -737
 ypos -4476
}
 Input {
  inputs 0
  name denoise
  xpos -694
  ypos -387
  number 1
 }
 Remove {
  operation keep
  channels rgba
  name Remove1
  xpos -694
  ypos -361
 }
set N11dc5f60 [stack 0]
add_layer {plate_denoise plate_denoise.red plate_denoise.green plate_denoise.blue plate_denoise.alpha}
 Shuffle {
  out plate_denoise
  name Shuffle2
  xpos -694
  ypos -213
 }
push $N11dc5f60
 Input {
  inputs 0
  name plate
  xpos -524
  ypos -392
 }
set N1276e860 [stack 0]
 Merge2 {
  inputs 2
  operation from
  name Merge1
  xpos -629
  ypos -306
 }
add_layer {grain grain.red grain.green grain.blue grain.alpha}
 Shuffle {
  out grain
  name Shuffle3
  xpos -629
  ypos -262
 }
push $N1276e860
 Copy {
  inputs 2
  channels grain
  name Copy1
  xpos -524
  ypos -245
 }
add_layer {plate_original plate_original.red plate_original.green plate_original.blue plate_original.alpha}
 Shuffle {
  green2 black
  out plate_original
  name Shuffle1
  xpos -524
  ypos -182
 }
 Merge2 {
  inputs 2
  operation copy
  output {rgba.red rgba.green rgba.blue -rgba.alpha}
  also_merge all
  name Merge2
  xpos -524
  ypos -113
 }
 Shuffle {
  alpha black
  name Shuffle4
  xpos -524
  ypos -87
 }
 Output {
  name Output1
  xpos -524
  ypos -37
 }
end_group