yeah, i had the same problem, and i was missing the
threshold slider in shake...
so made a gizmo which can acts very similar to a median
filter for the cases i need but is a lot faster.. i also
added a threshold slider.
sorry for the incomplete documentation, i wanted to clean it
up sometime and put it on nukepedia along with a few other
things, but you know how it is ;)
the default settings use a fast blur and a difference merge
to find which pixels to replace with the blur. for more
complex things there's two more inputs to feed another
difference image, and/or a different replacement image.
there's also a map option i find very useful which shows
which pixels will be affected...
if somebody got a better way i'd be interested to hear about
it.
++ chris
http://pastebin.com/Ceftw2T5
set cut_paste_input [stack 0]
push $cut_paste_input
Group {
name cmDifference
help "This is a gizmo which compares one input to another and
replaces only pixels above a certain difference threshold. By
default there is a blur and a median filter built in to use. You
can also use a third input to replace the pixels with a modified version"
tile_color 0xff0000ff
label "\[value multiply] / \[value gamma]"
selected true
xpos -155
ypos -390
addUserKnob {20 User}
addUserKnob {41 channels T Median1.channels}
addUserKnob {6 useDiffInput l "use difference input for
alpha/replace" +STARTLINE}
addUserKnob {6 useCorrInput l "use corrected input for
replace" +STARTLINE}
addUserKnob {41 PixelMap l "Pixel map" t "Shows the r/g/b
pixels that get affected by the mixing operation." T View_Matte.PixelMap}
addUserKnob {26 ""}
addUserKnob {41 gamma l shadowWeight t "gamma operation.
\naffects the weighting of shadow to highlights of the inputs to
compare" T GradeBlackWeighting1.gamma}
addUserKnob {41 multiply l threshold t "multiply
operation.\nThis multiplies the difference between original and
filtered image. Higher values means more pixels get affected." T Grade_Difference.multiply}
addUserKnob {41 which_1 l "threshold mix" T Threshold_Mix.which}
addUserKnob {41 disable_1 l disable -STARTLINE T Threshold_Mix.disable}
addUserKnob {26 ""}
addUserKnob {6 use_blur l "use blur for alpha/replace" +STARTLINE}
use_blur true
addUserKnob {41 size_1 l size T Blur1.size}
addUserKnob {41 filter T Blur1.filter}
addUserKnob {26 ""}
addUserKnob {6 use_median l "use median for alpha/replace" +STARTLINE}
addUserKnob {41 size t "radius of the default median
operation" T Median1.size}
addUserKnob {26 ""}
addUserKnob {41 which l Mix t "Mixback with original." T Dissolve1.which}
}
Input {
inputs 0
name Input_diff
xpos 231
ypos 327
number 1
}
Dot {
name Dot13
xpos 265
ypos 535
}
Input {
inputs 0
name Input_Src
xpos 179
ypos 271
}
Dot {
name Dot11
xpos 213
ypos 393
}
set N227d1960 [stack 0]
Dot {
name Dot4
xpos 391
ypos 393
}
set N227d43e0 [stack 0]
Median {
size 1
maskChannelMask -rgba.alpha
maskChannelInput -rgba.alpha
name Median1
xpos 357
ypos 436
disable {{!parent.use_median i}}
}
Blur {
channels rgb
size 2.5
filter box
name Blur1
xpos 357
ypos 486
disable {{!parent.use_blur i}}
}
Switch {
inputs 2
which {{parent.useDiffInput i}}
name Switch_mod_src1
xpos 357
ypos 532
}
set N227e7250 [stack 0]
Grade {
gamma {{parent.GradeBlackWeighting1.gamma.main i}
{parent.GradeBlackWeighting1.gamma.main i}
{parent.GradeBlackWeighting1.gamma.main i}
{parent.GradeBlackWeighting1.gamma.main i}}
name GradeBlackWeighting2
xpos 492
ypos 532
}
push $N227d43e0
Dot {
name Dot3
xpos 630
ypos 393
}
Grade {
gamma 1.5
name GradeBlackWeighting1
xpos 596
ypos 526
}
Merge2 {
inputs 2
operation difference
Achannels rgb
Bchannels rgb
output rgb
name Merge1
xpos 547
ypos 591
}
Grade {
channels {rgba.red rgba.green rgba.blue -rgba.alpha}
multiply 15
name Grade_Difference
xpos 547
ypos 655
}
set N22709cf0 [stack 0]
Expression {
expr0 "r > 0.5 ? 1 : 0"
expr1 "g > 0.5 ? 1 : 0"
expr2 "b > 0.5 ? 1 : 0"
name Threshold_RGB
xpos 547
ypos 695
}
push $N22709cf0
Clamp {
channels rgb
name Clamp1
xpos 448
ypos 694
}
Dissolve {
inputs 2
channels rgb
which 1
name Threshold_Mix
xpos 547
ypos 741
}
Dot {
name Dot6
xpos 581
ypos 786
}
set N22725a60 [stack 0]
Dot {
name Dot8
xpos 581
ypos 868
}
set N22728450 [stack 0]
Dot {
name Dot7
xpos 581
ypos 938
}
set N2272af40 [stack 0]
Dot {
name Dot1
xpos 581
ypos 1000
}
push $N2272af40
Input {
inputs 0
name Input_corr
xpos 285
ypos 268
number 2
}
Dot {
name Dot12
xpos 319
ypos 639
}
push $N227e7250
Switch {
inputs 2
which {{parent.useCorrInput i x904 0}}
name Switch_mod_src
xpos 357
ypos 636
}
Dot {
name Dot10
xpos 391
ypos 720
}
set N22739650 [stack 0]
Dot {
name Dot5
xpos 391
ypos 815
}
set N2273c1a0 [stack 0]
Dot {
name Dot9
xpos 391
ypos 897
}
push $N22728450
push $N2273c1a0
push $N22725a60
push $N22739650
push $N227d1960
Keymix {
inputs 3
channels {rgba.red -rgba.green -rgba.blue}
maskChannel rgba.red
name KeymixRed1
xpos 179
ypos 778
}
Keymix {
inputs 3
channels {-rgba.red rgba.green -rgba.blue}
maskChannel rgba.green
name KeymixGreen1
xpos 179
ypos 860
}
Keymix {
inputs 3
channels {-rgba.red -rgba.green rgba.blue}
maskChannel rgba.blue
name KeymixBlue1
xpos 179
ypos 930
}
Switch {
inputs 2
which {{PixelMap i}}
name View_Matte
xpos 179
ypos 997
addUserKnob {20 User}
addUserKnob {6 PixelMap +STARTLINE}
}
push $N227d1960
Dot {
name Dot2
xpos 134
ypos 393
}
Dissolve {
inputs 2
which 1
name Dissolve1
xpos 100
ypos 1073
}
Output {
name Output1
xpos 100
ypos 1143
}
end_group
On 5/25/11 at 12:40 AM, [email protected] (Johan Boije) wrote:
Thank you for the tip. Still can't understand the speed
difference though.
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