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  1. Hello

    I've just learned of using programs such as avisynth with filters to restore video, I must say my experience is very low but I'm still learning. I searched the forum before making this thread but couldn't find much related

    I was wondering if someone could point me in the right direction to restoring something such as this

    a screen cap of the raw .vob from the dvdrip, its very interlaced and the quality isn't the best, I'm looking for a way to enhance it be little or big
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  2. Always Watching guns1inger's Avatar
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    Before you get too carried away, be aware that interlacing isn't always a problem that needs to be fixed. Most players and TVs will happily deal with it appropriately. usually, interlacing is only a problem when someone tries to remove it badly and leaves a mess in it's place.

    Not sure what you mean by "a way to enhance it be little or big". If you are talking about resizing, then down is your only realistic option. If you want to keep the maximum detail, don't deinterlace, but separate the fields, resize, then reintegrate them. If you are talking about upscaling then look at specialist upscaling tools, and prepare to be disappointed by the amount of time they require to process, versus the mediocre quality they produce.
    Read my blog here.
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  3. Well the resolution is fine, what I meant is there anyway to perhaps enhance the quality? The coloring (it seems dull and hazy) or perhaps smoothen it? everything seems so sharpened
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  4. I don't understand what you are asking. Can you clarify?

    The black level might be a bit high. You can use a levels filter to bring it down. This will improve the contrast and it will look less washed out. (Maybe this is what you were referring to by "dull and hazy" ?)

    How did you take the screenshot? The method and software used can affect the appearance. eg. If you use a VMR renderer in MPC it will give you that elevated black level and "milky washed out" appearance. But the levels might be different in the actual video. You would need to examine the video with a YUV waveform monitor.
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  5. Video Restorer lordsmurf's Avatar
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    I would not use Avisynth for color correction -- not really the best tool.

    For this sort of work, I'd be using Adobe Premiere Pro.
    As a runner-up, VirtualDubMod.
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  6. Banned
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    We don't have a direct frame from your original vob (we'd need a short cut of the original clip for that). But working with the .png you submitted earlier, I made these corrections with a single gradation curve filter in VirtualDub:

    Image
    [Attachment 8502 - Click to enlarge]


    Most of the correction is in the white and black points, with some mild work on the midtones. The gradation curve was also set in its luminance panel to keep blacks and darks within broadcast tolerance (I used Rec601 here). Very few rips and captures can be adjusted with a single filter. This could still use more fiddling.

    Sometimes working with YUV source colorspaces (as in Avisynth) is necessary for correcting major problems at the source stage, but most color work and tweaking is done in RGB (VirtualDub, Premiere, Vegas, After Effects, Photoshop, Final Cut, Corel, you name it).

    You will have to learn to read pixel values to work with any kind of color or levels correction. A cheap (free) pixel sampler is here: http://www.netreach.net/~gavin/gavsfreeware/csamp.htm

    The filter I used to modify the image above is discussed here: http://members.chello.at/nagiller/vdub/tutorial/tutorial.html and can be downloaded here: http://members.chello.at/nagiller/vdub/gradation.zip . The VirtualDub Gradation Curve plugin is similar to Photoshop/Premiere/AE/ColorFinesse gradation curves, and can import Photoshop curve settings.

    In order to use filters such as these, you have to:
    (a) learn to recognize color and level problems and what causes them.
    (b) learn the basics of RGB color, and develop an eye for three basic hues: black, gray, and white.
    (c) Don't try to correct color by eyeball alone. Learn to use histograms, vectorscopes, curves, and levels.
    (d) Working on an uncalibrated monitor is a waste of time and effort. Throw away your THX test disk and your Video Essentials DVD, and check this out: http://www.tftcentral.co.uk/reviews/eye_one_display2.htm

    Hope this helps.
    Last edited by sanlyn; 20th Mar 2014 at 17:23.
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    Originally Posted by TLE6 View Post
    . . . a screen cap of the raw .vob from the dvdrip, its very interlaced and the quality isn't the best, . . .
    All source video of this type is supposed to be interlaced, But I think you refer to the motion of the blue glove on the fighter facing us *and jagged edges on motion of his upper arm), and to one hand of the fighter with his back to us. Fast motion is often blurred in video, especially on film. But we don't have the original .vob, so this is a guess, but those jaggies suggest that your ripper or other processor has the field order reversed.
    Last edited by sanlyn; 20th Mar 2014 at 17:23.
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  8. As noted, the video is supposed to look interlaced. Interlaced frames consist of two half pictures, intended to be viewed separately. Flipping back and forth between them at 2 fps:

    Click image for larger version

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    That gives your video an effective rate of 50 images per second rather than 25 images per second. The latter would be noticeably more jerky.

    I did a little levels and colors adjustments too. I assumed the cushion in the corner was supposed to be white (which may or may not have been the case).

    ColorYUV(gain_y=40, gamma_y=40, off_y=-36) #levels, gamma
    ColorYUV(off_u=5, off_v=-1) #white balance
    ColorYUV(cont_u=100, cont_v=100) #increase saturation
    Click image for larger version

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    I use CSamp, ColorYUV() and Histogram() a lot for these types of adjustments. You need to use a wider range of shots to fine tune the adjustments.
    Last edited by jagabo; 4th Sep 2011 at 09:02.
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  9. Video Restorer lordsmurf's Avatar
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    It has to be off-white. sanlyn's correction is correct.
    Jagabo, yours is shifted cyan/green/blue. So it can't be 100% white. It over-corrects.

    That's a great example of why correction via Avisynth is a bad idea.

    It helps to have a calibrated monitor.
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  10. Originally Posted by lordsmurf View Post
    It has to be off-white. sanlyn's correction is correct.
    Jagabo, yours is shifted cyan/green/blue. So it can't be 100% white. It over-corrects.
    Yes, I knew you wouldn't like it and the overall colors are a little too cyan. That's why I told him the correction was based on the assumption that the cushion should be white -- and that assumption may not be the case. I gave the full script split into individual sections so the OP could see what each section did. And left it to him to adjust the script to his liking. And brought up the point that you can't base the correction of the entire video based on one frame.
    Last edited by jagabo; 4th Sep 2011 at 10:57.
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  11. Video Restorer lordsmurf's Avatar
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    Originally Posted by jagabo View Post
    Yes, I knew you wouldn't like it
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    Originally Posted by jagabo View Post
    Yes, I knew you wouldn't like it and the overall colors are a little too cyan.
    Whatever. There must be dozens of ways to interpret this shot (some of my "blacks" are a little blue, too.) I found the original somewhat green, with tepid darks. I didn't start with white, though, I started with the grays and near-blacks of camera gear, + black lettering on the whitish sign in the background, and black hair of orientals. As for the fighter wearing dark trunks, I wouldn't try that to sample black/dark gray unless there was no other choice; it could easily be some off-color thingie. My version of the floor and mid-tones is too bright (anyone ever see a pure white deck in a boxing ring?). The upper darks of some of the spectators is too dim, so they tend to disappear. I also note in my version that the blackish trunks on the boxer lack detail, and my red trunks look a little, well, too red (toward pink? How cute). So I'd do more work, bump up the lower colors a bit in the RGB 32-64 range, etc. Then again, some people might want something different. As Fats might say: it do get complicated, do it not?

    Originally Posted by jagabo View Post
    I gave the full script split into individual sections so the OP could see what each section did. And left it to him to adjust the script to his liking.
    IMHO, that's what most people will do.

    Originally Posted by jagabo View Post
    And brought up the point that you can't base the correction of the entire video based on one frame.
    Right on.
    Last edited by sanlyn; 20th Mar 2014 at 17:23.
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  13. Judging by the 1st picture posted i say this video look more than adequate as is. To me enhancing it wouldn't be worth it if you don't go for a 720/1080p / deinterlaced / HD matrix convertion type of output. mpeg2 back to mpeg2 is a no-no
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    Originally Posted by themaster1 View Post
    Judging by the 1st picture posted i say this video look more than adequate as is. To me enhancing it wouldn't be worth it if you don't go for a 720/1080p / deinterlaced / HD matrix convertion type of output. mpeg2 back to mpeg2 is a no-no
    Agreed, for the most part (the original blacks are too light, but they're actually fairly clean). Sometimes you just want "more". It's almost a given.
    Last edited by sanlyn; 20th Mar 2014 at 17:23.
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  15. Yes, the major problem is the black level. You have to decide if the tradoff of fixing that is worth the additional round of MPEG artifacts from reencoding. Verses just using the brightness and contrast controls on the TV when you watch the original disc.
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