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Visible gradation in source video – any way to “smooth” it out?
Hi all,
I’ve found from my collection of given videos that one of them has visible gradation steps specifically apparent in regions where dark blue is the dominant color, confirmed to be within the video itself and not a display error, this is the only “master” that is available and is to be used, anybody have an idea to “smooth” out just the gradation in the video or make it less visible?
It’s not as severe as gradation in an image with a palette of 256 colors, just that particular dark blue area is affected, the other colors are fine.While I’m here, can someone point me in the right direction where if there’s a plugin for Vegas or Virtualdub that simulates “dot crawl”?
(Came across this: https://www.creativecrash.com/shake/downloads/macros/filters-effects/c/betacam)Thanks in advance.
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12 Replies
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[Rick Anvican] “….anybody have an idea to “smooth” out just the gradation in the video or make it less visible?”
_______________________________________________________________It would be easier for me if you could supply a Preview SCREENGRAB of the issue?
Cheers
Grazie
Video Content Creator and Potter
PC 7 64-bit 16gb * Intel® Core™i7-2600k Quad Core 3.40GHz * 2GB NVIDIA GEFORCE GTX 560 Ti
Cameras: Canon XF300 + PowerShot SX50HS Bridge -
Hi Graham,
It’s ok now, I managed to “blur” the gradation steps by duplicating the source video to a layer set at screen mode, and masking/feathering accordingly the affected areas. Thanks for responding anyway,
Rick
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Another happy Customer – AND I didn’t have to move a digit!
What was your means of thinking it through?
Grazie
Video Content Creator and Potter
PC 7 64-bit 16gb * Intel® Core™i7-2600k Quad Core 3.40GHz * 2GB NVIDIA GEFORCE GTX 560 Ti
Cameras: Canon XF300 + PowerShot SX50HS Bridge -
I started to use the compositing modes in Vegas more recently so I just played around with the different modes to see what effects come up, “screen” worked best but I only wanted affected areas to be corrected, so then I masked and feathered until it was as close to original on the unaffected areas.
Duplicating layers wasn’t my idea originally, I got it from here (https://www.sundancemediagroup.com/articles/Glamour-Compositing.htm), you know this website?
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[Rick Anvican] “, you know this website?”
Yes. John Rofrano is one of the colleagues.
Thanks for sharing your approach. It’s that that make others here want to try it out too.
Grazie
Video Content Creator and Potter
PC 7 64-bit 16gb * Intel® Core™i7-2600k Quad Core 3.40GHz * 2GB NVIDIA GEFORCE GTX 560 Ti
Cameras: Canon XF300 + PowerShot SX50HS Bridge -
Oh, didn’t know that John was one of the colleagues before, but I did learn a lot from it though,
for my situation it worked out nicely, hopefully others can make good use of the knowledge too. -
You are describing banding, an artifact of compression of solid colors. Sounds like you found a good solution.
Steve Mann
MannMade Digital Video
http://www.mmdv.com -
I’m glad it worked for me Stephen, just wondering how the banding only affected the dark blue regions and not any other color…
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[Rick Anvican] “I’m glad it worked for me Stephen, just wondering how the banding only affected the dark blue regions and not any other color…”
Banding happens when video is compressed and similar colors get posterized. Compression removes some subtle color differences, so 127,127,250 and 127,127,251, ,,252, ,,253 may all be compressed to 127,127,252. Repeat this over a large area and you get banding.
Steve Mann
MannMade Digital Video
http://www.mmdv.com -
I really like Red 101:
https://www.red.com/learn/red-101
Good article on chroma sub-sampling, not sure if it applies to the banding problem, but still good to know.
https://www.red.com/learn/red-101/video-chroma-subsampling
Steve
Win7 Pro X64 on Dell T7500, MultiTB SATA, 12GB RAM, nVidia Quadro 2000, Vegas 12, 11, 10, 9 DVDA 6.0 & 5.2(build 135) Sony HDR-CX550V, Panasonic GH3 with LUMIX G X VARIO 12-35mm / F2.8 ASPH, LUMIX G X VARIO 35-100mm / F2.8
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