floating chroma shift issue?

[Selur]

Second parameter is float "varC" = variance chroma, which should be sigma_vU, sigma_vV in vsTCanny. Not sigmaU.
more something like:

v2= vsTCanny(v2, sigmaY=50.0, sigma_vU=50.0 + gblur, sigma_vV=50.0 + gblur, mode=-1)

(using 50 instead of 7)

[cinephil]

Well, "=50" - rises the highlights (unlike "=7"), but either way not resolve "border" issue.

Not sure what "variance chroma" mean exactly, but I guess it somewhat different from "Standard deviation of vertical gaussian blur" - which in vsTCanny is sigma_vY, sigma_vU, sigma_vV (and sigmaY, sigmaU, sigmaV - Standard deviation of horizontal gaussian blur.)

[Selur]

It should be the deviation for U and V as I understood it. )
I assume you did simplify your script to stop after the ContrastMask calls to be sure this is not caused by something else, right?

[cinephil]

I assume you did simplify your script to stop after the ContrastMask calls to be sure this is not caused by something else, right?

Well, if I will not tweak after ContrastMask - the picture will be wash out and I won't see any difference.
Right now it look like this:

old ContrastMask

SeparateFields()
MergeChroma(last, Spline36Resize(width/2, height).aWarpSharp2(depth=30).nnedi3_rpow2(2, cshift="Spline36Resize", fwidth=width, fheight=height))
Weave()

ConvertToYV12(matrix="rec601", interlaced=true)

SeparateFields() 
even = SelectEven(last).ContrastMask(enhance=3.0)
odd = SelectOdd(last).ContrastMask(enhance=3.0)
Interleave(even, odd)
Weave()

ConvertBits(16) 

ColorYUV(gamma_y=-35, cont_y=46, gain_y=-10, off_y=0)
Tweak(bright=3, coring=false)
Tweak(cont=0.9)
Tweak(Hue=-16)

FFT3DFilter(bt=-1, sharpen=0.3, interlaced=true)

ConvertBits(bits=8, dither=1)

new ContrastMask

ConvertBits(16) 

SeparateFields()
MergeChroma(last, Spline36Resize(width/2, height).aWarpSharp2(depth=30).nnedi3_rpow2(2, cshift="Spline36Resize", fwidth=width, fheight=height))
Weave()

SeparateFields()
even = SelectEven(last).ContrastMask(enhance=3.0)
odd = SelectOdd(last).ContrastMask(enhance=3.0)
Interleave(even, odd)
Weave()

ColorYUV(gamma_y=-35, cont_y=46, gain_y=-10, off_y=0)
Tweak(bright=3, coring=false)
Tweak(cont=0.9)
Tweak(Hue=-16)

FFT3DFilter(bt=-1, sharpen=0.3, interlaced=true)

ConvertBits(bits=8, dither=1)
ConvertToYV12(matrix="rec601", interlaced=true)

[Selur]

With 'old ContrastMask' you used MergeChroma on 8bit, not you use it on 16bit.

As a general side node:
Your field handling seems odd / wrong to me, can you explain why you do it that way?

• Convert to 16bit (okay)
  Unsure why since afaik. none of the filters you use here does benefit from it, so it's just a slow-down)
• You separate the fields. (okay)
• You do some chroma adjustments on the separated fields. (okay)
• You weave the fields and then separate them again => this seems wrong. Can you explain why you do that?
• You apply ContrastMask on the fields. (okay)
• You re-interlace the fields using Interleave(even, odd) and Weave(). (okay)
• You change the colors of the interlaced content. (okay)
• You apply FFT3DFilter it the interlaced content. (okay)
• You convert to 8bit, while dithering (okay)
• You convert to YV12 (okay)

Personally I would, deinterlace the content, apply the filters and at the end re-interlace the file, instead of working on the separated fields.
The first step for me would be deinterlacing and the last step would be the re-interlacing.

Cu Selur

[cinephil]

With 'old ContrastMask' you used MergeChroma on 8bit, not you use it on 16bit.

MergeChroma part handling some chroma ringing issue, I can't lose that step.

As a general side node:
Your field handling seems odd / wrong to me, can you explain why you do it that way?
[*]Convert to 16bit (okay)
Unsure why since afaik. none of the filters you use here does benefit from it, so it's just a slow-down)

It's for dithering while converting to 8bit, - to remove the banding.

[*]You weave the fields and then separate them again => this seems wrong. Can you explain why you do that?

I think, there was something between this, but not anymore.

Personally I would, deinterlace the content, apply the filters and at the end re-interlace the file, instead of working on the separated fields.
The first step for me would be deinterlacing and the last step would be the re-interlacing.

There is mixed content of film and video (true 29.97 fps) [but not in this 03.avi clip]. So to avoid complication/problems (and not to lose video frames) I stay interlaced.

[Selur]

MergeChroma part handling some chroma ringing issue, I can't lose that step.

You should do that in the original bit depth,...

It's for dithering while converting to 8bit, - to remove the banding.

use a debanding filter instead

There is mixed content of film and video (true 29.97 fps) [but not in this 03.avi clip]. So to avoid complication/problems (and not to lose video frames) I stay interlaced.

bob deinterlace then. You are not staying interlaced, why you do, atm. isn't keeping the content interlaced,..

[cinephil]

So it will be something like this?

AssumeTFF()
Bob(0.0, 1.0)

MergeChroma(last, Spline36Resize(width/2, height).aWarpSharp2(depth=30).nnedi3_rpow2(2, cshift="Spline36Resize", fwidth=width, fheight=height))

ContrastMask(enhance=3.0)

ColorYUV(gamma_y=-35, cont_y=46, gain_y=-10, off_y=0) #cont_y=46
Tweak(bright=3, coring=false)
Tweak(cont=0.9)
Tweak(Hue=-16)

FFT3DFilter(bt=-1, sharpen=0.3)

neo_f3kdb(range=31, keep_tv_range=true, grainY=0, grainC=0, output_depth=8)

ConvertToYV12(matrix="rec601")

AssumeTFF.SeparateFields().SelectEvery(4,0,3).Weave()

I will do some testing tomorrow. But debanding filter, as I see on the Histogram - not doing good enough to replace ->16bit->8bit(dithering).