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  1. Hi guys

    I have one video that has probably been recorded in camera sephia mode and thus it has brauinsh tone.
    Is this reparable in software? I tried with avysinth ColorYUV and MSU old color restoration i will post samples but not good.

    Thanks
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  2. Member
    Join Date: Sep 2007
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    Not with very good results

    The principle is similar to colorizing a black and white sourc
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  3. That's what i get almost faint colored video

    thanks pois

    to bad the cameraman recorded in sephia some parts of the wedding video
    this is what i got so far
    Attached Thumbnails Click image for larger version

Name:	biba.png
Views:	45
Size:	1.88 MB
ID:	18194  

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  4. Member Cornucopia's Avatar
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    Not counting the sepia tone itself (note the correct spelling), if there is any REMAINING color in the shot, it can be enhanced. However, I know of a number of devices which drop ALL color prior to adding the sepia, so with those kinds of shots, you would be stuck in the same way that people with Black & White movies are when attempting colorize a video.
    And that kind of work is probably too much effort that it is worth!
    For the former, though, you would just increase the saturation's range (e.g.: your sat goes from 0 - 20%, so you increase its "contrast" to be 0 - 75%). This can be done with many tools, though I would recommend AVISynth if you're up for scripting.

    Scott
    "When will the rhetorical questions end?!" - George Carlin
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    Quick test in GIMP:
    Click image for larger version

Name:	sepia_enhance_v2.jpg
Views:	46
Size:	459.7 KB
ID:	18196
    (RGB Curves + Saturation boost + more RGB Curves)

    There is some colour present... but because it's at such a low level on the tape it's largely drowned out by chroma noise.

    AviSynth NR filters can probably come to the rescue here (I don't use it so someone else would have to advise).
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  6. Member DB83's Avatar
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    A sample of the actual vid, rather than a cap, may help as well.
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  7. ColorYUV(cont_u=-256, cont_v=-256), Tweak(sat=0) or GreyScale() will all give perfect greyscale.

    Something roughly like intracube's adjustments, but just with ColorYUV:

    Code:
    ColorYUV(off_u=8, off_v=-17) # remove sepia
    ColorYUV(cont_u=1000, cont_v=1000) # increase color saturation
    ColorYUV(cont_y=100, gamma_y=100, off_y=-12) # adjust levels, gamma
    So the chroma noise definitely overwhelms the remaining color in the video. A more colorful clip might be more useful. And a full video clip to determine how much of the chroma noise can be removed.
    Last edited by jagabo; 3rd Jun 2013 at 17:28.
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    Yes, it might ok if a strong chroma noise filter is applied after . But with spots that bad, sometimes there are huge gaps or "blobs" that appear with strong chroma noise settings in place of the colored spots

    I had assumed wrongly that this was black and white sepia (no color remaining from original source) ; that type is almost impossible to improve short of lots of manual recolorization
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  9. I captured the file it is in the original recording. The tape it self is very unplayble except on ag1980 on wich machine it is recorded. Then i use this avisynth script to correct drop outs that ocur in the video
    AVISource("")
    AssumeTFF()
    Load_Stdcall_Plugin("C:\Program Files (x86)\AviSynth 2.5\plugins\yadif.dll")
    Yadif(mode=1, order=1)
    f1=SelectEven().Devcr(10).Devcr(10)
    f2=SelectOdd().DeVCR(10).Devcr(10)
    Interleave(f1,f2)
    SeparateFields().SelectEvery(4,0,3).Weave()
    ColorYUV(gain_y=5,gain_v=-25,gain_u=+10)
    #ConverttoYV12(interlaced=true)
    #Histogram(mode="levels")
    #FixVHSOversharp(30,14,10)
    ConverttoRGB32(matrix="Rec601",interlaced=true)

    Then i do denoising with neat video and cameracolor denoise ( it helps alot with color shift or bluring) in vdub and then encode


    Some unprocesed videos :
    Attached Files
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  10. Member DB83's Avatar
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    For the purposes of clarification, are these clips after that script or before ?

    The reason I ask is because I can no longer detect any color.
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  11. For the purposes of clarification, are these clips after that script or before ?

    The reason I ask is because I can no longer detect any color.
    The clips are pure unprocessed before the script. I used the jagabo suggestion ( i changed it a bit less colorization and contrast) and got something like this after color correction and denoise (first image).

    The second image saturated without nr and with nr
    Attached Thumbnails Click image for larger version

Name:	test ?.png
Views:	60
Size:	1.81 MB
ID:	18201  

    Click image for larger version

Name:	with and without.png
Views:	49
Size:	1.91 MB
ID:	18203  

    Last edited by mammo1789; 3rd Jun 2013 at 19:32.
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  12. Member
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    That looks promising.


    If you remove the blue tint you could bump up the saturation a bit further:

    Click image for larger version

Name:	sepia_enhance_2.jpg
Views:	31
Size:	63.0 KB
ID:	18259

    The chroma noise is starting to reappear again though...
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    Also note that one size doesn't fit all here, you'll have to go on a shot-by-shot basis. Some of your clips really have no useful color information -- it was shot under dim flourescents with an older camera.
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  14. Originally Posted by smrpix View Post
    it was shot under dim flourescents with an older camera.
    Which may be why it was converted to sepia tones.
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  15. Member
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    Originally Posted by jagabo View Post
    Which may be why it was converted to sepia tones.
    That was my initial thought before seeing the clips and based on OP's question -- but now I'm inclined to think that was the best the camera could do, compensating for greenish flourescents. There's a few frames of a girl in red with red hair standing directly under a light in clip 1 which gave me second thoughts. As has been mentioned here earlier, camera sepia mode usually drops all color and adds a tint. --Not sure.


    Name:  test1.avi_snapshot_00.01_[2013.06.06_08.39.53].jpg
Views: 39
Size:  50.7 KB
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