remove one color from video

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  05 May 2012
remove one color from video

Hi people.

Iīm newbie here in Nuke.

Wondering how the hell can i remove some yellow shiny signs in a video , they distract the viewer. I want to , at least, bring the color down (bright yellow, which is nowhere else in the scene) so i donīt see it that shiny.

Iīve tried several methods but i donīt know how exactly people do it. What would you use for this?

Thanks a lot!
  05 May 2012
I'd go for the HueCorrect node and lower the saturation or change the hue value for the desired color range.
  05 May 2012

Well. i tried this, this should be working, but i donīt really understand this, not even reading the documentation.
I select Saturation. Then using Ctrl+alt i click on the screen where the yellow color is. It selects automatically with a yellow line the yellow zone of the spectrum.

I suppose this is the zone i have to low down, so i create a point on the courve there and move it down to the maximum. Nothing happens.

I try with luminance, what happens is that many things in the place change, but not this color.

So weird.

Thanks for all!
  05 May 2012
A curve like in the attachment would desaturate all yellowish tones.

Posting a picture of your problem/shot would help.
Attached Images
File Type: png Screen shot 2012-05-08 at 19.06.24.png (87.9 KB, 6 views)
  05 May 2012
THANKS for the image.

I knew it was like that, i tried different aproaches, and it looks really horrible. Itīs not smooth at all...

Bringing down the saturation works fine with this tone, but it turns it even more bright, i mean, white. But doing what you tell me works so bad.

What i would show you is just the same you're showing me, thatīs why i donīt updload an image...
  05 May 2012
you could also try to make a key of the yellow color with primatte and use that mask to colorcorrect your footage
  05 May 2012
Yes people. Great ideas. Thanks a lot.

I finally got it by changing the HUE that way.

thanks a lot!
  05 May 2012
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