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28th May 2018, 13:07 | #1 | Link |
Acid fr0g
Join Date: May 2002
Location: Italy
Posts: 2,580
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Diving video
Back from my diving travel, I have a bunch of video, shooted with a cheap underwater camera.
Some are nicely balanced, others, like this, have dead red channel and a very dominant blue. I am asking your help, to get a functional script to give back some realistic colors. I saw many video tutorials, that apply to professional (and costly) software. I know the physic behind water color absorption depth but I have no idea about how to automatically reverse the process. Tried with GamMaC but I get horrible results. Thanks.
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@turment on Telegram Last edited by tormento; 28th May 2018 at 16:58. Reason: Fixed broken link |
28th May 2018, 15:56 | #3 | Link |
HeartlessS Usurer
Join Date: Dec 2009
Location: Over the rainbow
Posts: 10,980
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Yep, file dont seem to be on server.
I've just fixed an Image link in RgbAdapt thread, PostImage changed link names from PostImage.org to PostImage.cc some months ago, so some of them (but not all) have gotten broken over time since then. https://forum.doom9.org/showthread.php?t=170642 here same link to RgbAdapt Graffer EDIT: No idea how to adjust automatically, maybe get rough settings using grapher, and vary SPow (on each channel identically), via some Blue:Red ratio, or something like that (no idea really). [EDIT: Vary args In ScriptClip] EDIT: Maybe try Martin53(AWB) or Bernardt white Balance funcs. EDIT: Or maybe keep all three channel Spow static, vary Red and Blue RPow as average green channel varies up and down, still no idea.
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I sometimes post sober. StainlessS@MediaFire ::: AND/OR ::: StainlessS@SendSpace "Some infinities are bigger than other infinities", but how many of them are infinitely bigger ??? Last edited by StainlessS; 28th May 2018 at 16:14. |
28th May 2018, 15:59 | #4 | Link |
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@ lansing - you can download with a download manager like jdownloader2 (useful but very bloated software, make sure you get the ad free version)
The red channel is almost non-existent. (e.g. convert to RGB and use showred) . Difficult to make it look realistic You can try some weighted average of G,B +/- manipulations to reconstruct the R , but it won't look "real". It will look off preview of R,G,B |
28th May 2018, 16:51 | #5 | Link |
Acid fr0g
Join Date: May 2002
Location: Italy
Posts: 2,580
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Sorry for the problematic link. Fixed.
What I do with images is use green channel to recreate red, while reducing blue component at the same time. Then I correct other aspects of image. It's so strange there is no script yet to correct such a common thing as diving videos. We have almost anything here but that I know it will be a trial and error process, such what happens to recolor bw, but let us try. Two video tutorial you can take as a reference are this and this.
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28th May 2018, 16:56 | #6 | Link | |
Acid fr0g
Join Date: May 2002
Location: Italy
Posts: 2,580
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Quote:
This is the possible result but it's way too limited to rendering to make it an acceptable solution.
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28th May 2018, 17:13 | #8 | Link | |
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28th May 2018, 20:47 | #13 | Link |
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Join Date: Sep 2006
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Your best choice is probably to get 3dlut creator for this:
https://www.youtube.com/watch?v=gHx0a4TKQbo |
28th May 2018, 21:31 | #14 | Link | |
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You're just mixing channels that demo, and you will have the same problems . What's not shown in that underwater demo is a "red" reference object, just as "red" coral, "red" fish, skin tones etc... It might look ok for some shots, but overall it will still be "off". The main problem is missing real red channel information, and a lot of it. There is only so much you can do , by mixing G/B and doing various manipulations |
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28th May 2018, 23:29 | #15 | Link | |
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28th May 2018, 23:58 | #16 | Link |
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Join Date: Mar 2015
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I process UW shots sometimes, I made VD plugin for it (not much different from some yuv adjust variation).
What I do is roughly these steps (in this order): 1. white balance - focused on some white/gray objects at pleasing distance 2. luma contrast (levels) 3. overall saturation boost 4. try to saturate/desaturate specific colors. Often the colors end up so much quantized it is just better to get rid of them completely. Not science, I just get something that I like to look at.
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VirtualDub2 |
29th May 2018, 01:22 | #17 | Link | |
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But I question the usefulness of a lut . If you're doing this in whatever GUI program, then why not just do it in there? If you use one that can keyframe, you can even adjust for exposure changes (eg. different depths), lighting condition changes etc...At least you can have consistent color, consistency color timing. |
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29th May 2018, 07:58 | #18 | Link | |
Acid fr0g
Join Date: May 2002
Location: Italy
Posts: 2,580
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Quote:
To quote other programs, please suggest me something free or cheap with a good interface and output control. Premiere is not cheap
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