False Masking and Yellowness Removal?

[th3obr0]

Hello,

I have a video with my friends snowboarding at night, but there's a lot of yellowness on it. It was shot from my Nokia E51's camera :P.

I heard there's something called false masking to remove it. It also helps in removing unwanted colors from the frames. Is it done by a plugin or something else?

Can anyone help me with that?

Thanks! :)

[zee944]

Post an unprocessed sample or a few screencaps at least.

[Mug Funky]

wtf is false masking? to get rid of the yellow tint the picture blue.

[edit]

out of curiosity, was this shot at night with "streetlight" style sodium-vapour lights? if that's the case there may not be any colour at all except yellow. chroma-keying the yellow and desaturating it would be a solution in this case (as well as an overall play with any other colours that may be there). this is more a colour-grading question than an avisynth one, but it is probably possible in avisynth. we'd need to see some of your footage.

[th3obr0]

I read about AVISynth ColorKeying, but no idea how to use it. I need something that completely removed one color off - something like RGB channels in Adobe Photoshop. Is there a way I can manipulate color channels using AVISynth??

[Mug Funky]

RGBadjust does traditional "gain, lift, gamma" adjustment. you can get something that works in photoshop and plug the values into RGBadjust if you've got the time :)

first three values are gain for red, green, blue respectively (scaled from 0.0 to 1.0), next three are offsets (from 0-255), and the next three are gamma (float - 1.0 is unity, ie. no change).

...actually, i didn't realise that the offsets and gammas had been added to RGBadjust. this is pretty cool.

my suggestion though, if you have difficult footage is to use the colour correction tools available in editing programs - they're a bit more friendly and use "ball based" settings, where you just need to drag a point to set a colour, rather than juggling red, green and blue values for ever. further to that, you can use something like apple's "colour", but there's a learning curve and a half with that, and even when you know how it works, it will not work as expected.

[Wilbert]

http://avisynth.org/mediawiki/Tweak with the starthue, endhue and sat settings.

[th3obr0]

http://avisynth.org/mediawiki/Tweak with the starthue, endhue and sat settings.

I use Tweak and YlevelS. I need help in managing luma, gama, and chroma levels. I want to know how to handle all kind of color problems. I mean, I want material which will help me manage color problems.

[Wilbert]

As zee944 said:
Post an unprocessed sample or a few screencaps at least.

[th3obr0]

As zee944 said:

I am not talking about that video now. It was that sodium light trick. I desaturated a bit and it looked better. Now what I am wanting to learn it color correction. Any suggestions or guides?

[neuron2]

Use Google.

We can't answer such open-ended questions.