problem with some red color

[greatfinders]

Hello i try to do the best encode of my Dragon ball dvd in private way but there is a small problem i can't correct with avisynth

a guy did it in his test but i can't contact him anymore.... i explain
http://screenshotcomparison.com/comparison/184093/picture:1

in the original one you have some red around line like a chroma bleeding or halo in the guy test it is solved (watch around goku's arm) .... i try some things but nothing work
can someone help me?
thanks

here a sample:
http://uptobox.com/gnikrk1ifsuc
or https://1fichier.com/?uhlcv7do5e
i just mux it in mkv to cut it , i didn't do any re-encode

[greatfinders]

here a screen of the problem....it is very annoyig me and i need help for this problem i couldn't resolve myself with some search
could someone really good to help me?



ere a comparison between the original and what it should have to be
http://screenshotcomparison.com/comparison/189673

[jagabo]

Sharpen the chroma with something like

MergeChroma(last, aWarpSharp(depth=10)) # sharpen chroma

If the chroma is still misaligned shift it as necessary:

ChromaShift(l=-2, c=-2) # shift chroma 2 lines up, 2 columns left

The video must be in YUV to use these. Interlaced video will require treating the fields separately.

Your sample image looked ok with just the sharpened chroma. Note that with YV12 video you can only shift the chroma by even values. So if you need to shift the chroma by an odd values you have to upscale to 2x, shift the chroma by 2, then downscale to the original size. And it's probably best to do this before sharpening the chroma (as the upscale, shift, and downscale will blur the chroma a bit) and retaining the original luma. Something like this:

MergeChroma(last, Spline36Resize(width*2, height*2).aWarpSharp(depth=10).ChromaShift(l=-2).Spline36Resize(width,height)) # sharpen chroma and shift it up by one scan line

Depending on how blurry the chroma is you may need to use higher values in aWarpSharp(). Using too high values will lose colors in corners.

Oh, it's often helpful to crank up the saturation when checking the alignment.

[LMotlow]

Some good points from jagabo to handle the chroma placement problems.

The color balance is atrocious. Reduce dark blue, raise bright blue a little, add a small amount of green, add lots of red. I used gradation curves in VirtualDub and lowered saturation a little with ColorMill:



gradation curve settings:

here a sample:
http://uptobox.com/gnikrk1ifsuc
i just mux it in mkv to cut it , i didn't do any re-encode

I don't think anyone will try to download a sample from a website that shows popup windows and tries to install software on the owner's PC. Find a better site.

[greatfinders]

thanks i already try the Chromashift but haven't think to try by upscaling ....for the moment all i try are not correct even with a color correction
it attenuate the things but don't correct


here the same sample elsewhere https://1fichier.com/?uhlcv7do5e

[jagabo]

thanks i already try the Chromashift but haven't think to try by upscaling ....

You'll probably want to sharpen the chroma as well as shift it.

[greatfinders]

thanks i already try the Chromashift but haven't think to try by upscaling ....

You'll probably want to sharpen the chroma as well as shift it.

no just resolve the red problem not upscaling

[jagabo]

I don't think you understand. You can only shift the chroma of YV12 video by multiples of 2. If you want to shift the chroma by 1 you need to upscale the video 2x, shift by 2, then downscale back to the original size. If you use MergeChroma the way I suggested you retain the original luma channel and replace the chroma channels with the shifted versions.

[greatfinders]

i use your line and just change some value to minimize things i haven't yet beat the things it just reduce it

[raffriff42]

You can only shift the chroma of YV12 video by multiples of 2.

That's true for ChromaShift - but not for ChromaShiftSP. You can shift by fractional pixels.

Also, it's possible to shift U and V separately - or in RGB space, you can shift Red and Blue separately:

function ShiftUV(clip C, float "ux", float "uy", float "vx", float "vy")
{
    Assert(C.IsYUV, 
    \  "ShiftUV: source must be YUV")
    ux = Float(Default(ux, 0))
    uy = Float(Default(uy, 0))
    vx = Float(Default(vx, ux))
    vy = Float(Default(vy, uy))
    C
    U = UtoY
    V = VtoY
    return YToUV(
    \   U.BilinearResize(U.Width, U.Height, -ux, -uy, U.Width, U.Height)
    \ , V.BilinearResize(V.Width, V.Height, -vx, -vy, V.Width, V.Height)
    \ , Last
    \ )
}

function ShiftRedBlue(clip C, float "rx", float "ry", float "bx", float "by")
{
    Assert(C.IsRGB, 
    \  "ShiftRedBlue: source must be RGB")
    rx = Float(Default(rx, 0))
    ry = Float(Default(ry, 0))
    bx = Float(Default(bx, rx))
    by = Float(Default(by, ry))
    C
    return (C.IsRGB24)
    \ ? MergeRGB(
    \     ShowRed.BilinearResize(Width, Height, -rx, -ry, Width, Height)
    \   , ShowGreen
    \   , ShowBlue.BilinearResize(Width, Height, -bx, -by, Width, Height)
    \   )
    \ : MergeARGB(
    \     ShowAlpha
    \   , ShowRed.BilinearResize(Width, Height, -rx, -ry, Width, Height)
    \   , ShowGreen
    \   , ShowBlue.BilinearResize(Width, Height, -bx, -by, Width, Height)
    \   )
}

[greatfinders]

i try with ChromaShiftSP like you tell me but when i use it to correct the red, there is some chroma bleeding green around the feet
someone can try with the sample i upload please?
thankkkkkkkkks a lot there is almost one month i try to correct it but i fail

[jagabo]

The colors will never align perfectly with the luma -- because the colors are encoded at half the resolution of the luma. And having been recorded on video tape reduced the color resolution even more.

[Caiosouza]

My look is of a layman, but my bet is:
As this is a film made in art, drawing, the artist may have chosen, for Z reasons (to rejoice,to contrast, to enrich ) different shades of red in each part, You can approach them but they will never be the same because, originally, they were never the same, it is not a mistake or problem, but rather a choice of the artist.

[raffriff42]

there is some chroma bleeding green around the feet

Try ChromaWarpSharpener. It reverses bleeding to some extent.

[greatfinders]

it's a little better but not corrected yet....it is possible because someone did it (but i cannot talk to him) http://screenshotcomparison.com/comparison/184093/picture:1
in his screenshot all is totally corrected