TimeEcho over N frames, invert/difference path to highlight pixels that barely change over time.
Dead Pixel Finder uses TimeEcho (frames behind) plus invert/difference and a small log blur to light up values that stay put across the lookback window, which is the usual stuck/dead photosite signature.
GUI switch keeps heavy paths off when not viewing. Good for spotting candidates before paint or a median fix.
set cut_paste_input [stack 0]
version 12.1 v4
push $cut_paste_input
Group {
name deadPixelFinder
tile_color 0x421010ff
selected true
xpos -1103
ypos 99
addUserKnob {20 User l deadPixelFinder}
addUserKnob {41 framesbehind l "Frames to look at" T TimeEcho1.framesbehind}
addUserKnob {26 ""}
addUserKnob {26 lbl l "" t "May 15, 2019 - v1.1 Refined\nMay 15, 2019 - v1.2 Gui only" +STARTLINE T "Dead Pixel Finder v1.2"}
addUserKnob {22 btn l DerekVFX.ca T "nuke.tcl('start', 'https://derekvfx.ca')" +STARTLINE}
}
Input {
inputs 0
name Input
xpos 447
ypos 61
}
Dot {
name Dot1
note_font_size 40
xpos 481
ypos 215
}
set Nd7a4800 [stack 0]
Dot {
name Dot2
note_font_size 40
xpos 640
ypos 215
}
Invert {
channels rgb
name Invert3
xpos 606
ypos 351
}
TimeEcho {
framesbehind 60
name TimeEcho1
selected true
xpos 606
ypos 411
disable {{"!\$gui"}}
}
Invert {
channels rgb
name Invert4
xpos 606
ypos 474
}
Dot {
name Dot170
note_font_size 40
xpos 640
ypos 554
}
set Nd7d5400 [stack 0]
Dot {
name Dot4
note_font_size 40
xpos 849
ypos 554
}
Colorspace {
colorspace_out Cineon
name Colorspace1
xpos 815
ypos 635
}
Blur {
channels rgba
size 0.67
name Blur18
label "\[value size] px"
xpos 815
ypos 689
}
Dot {
name Dot5
note_font_size 40
xpos 849
ypos 769
}
push $Nd7d5400
Colorspace {
colorspace_out Cineon
name Colorspace2
xpos 606
ypos 644
}
Merge2 {
inputs 2
operation difference
bbox B
name Merge83
xpos 606
ypos 765
}
Grade {
whitepoint 0.0002
gamma 0.455
name Grade20
xpos 606
ypos 805
}
FrameHold {
first_frame {{last_frame}}
name FrameHold1
xpos 606
ypos 849
}
Dot {
name Dot3
note_font_size 40
xpos 640
ypos 939
}
push $Nd7a4800
Remove {
operation keep
channels rgba
name Remove1
label "\[value channels]"
xpos 447
ypos 343
}
Multiply {
channels rgba
value 0
name Multiply1
label "\[value value]"
xpos 447
ypos 413
}
Switch {
inputs 2
which {{"\$gui"}}
name Switch1
label "\[value which]"
xpos 447
ypos 929
}
Output {
name Output1
xpos 447
ypos 1055
}
end_group