Keyers

[Malcolm]

Hi all,

I'm a bit perplexed with keyers. This is my first foray into using them so please forgive me for any stupidity.

I basically am trying to use a duplicate of a clip to brighten certain areas of the original. So I put the duplicate on a track above the original, and lumakey to select the area I want. Then I say to myself, seems like if I add an Addition Blend operator to that track, it will add the pixel values that haven't been keyed away to the original clip?
This is where I discover that each track only accepts one keyer operator :(

Why is this?
And what is the easiest way of accomplishing what I am trying to do?

I don't understand why the keyers don't stack like other effects.

What if I want to use a combination of chroma AND luminance keying to get the precise matte I want?

Thanks for any light you can shine on this!

M.

[Khoi Pham]

Hi all,

I'm a bit perplexed with keyers. This is my first foray into using them so please forgive me for any stupidity.

I basically am trying to use a duplicate of a clip to brighten certain areas of the original. So I put the duplicate on a track above the original, and lumakey to select the area I want. Then I say to myself, seems like if I add an Addition Blend operator to that track, it will add the pixel values that haven't been keyed away to the original clip?
This is where I discover that each track only accepts one keyer operator :(

Why is this?
And what is the easiest way of accomplishing what I am trying to do?

I don't understand why the keyers don't stack like other effects.

What if I want to use a combination of chroma AND luminance keying to get the precise matte I want?

Thanks for any light you can shine on this!

M.

You want to use color correction for this, narrow down the color spectrum and adjust it, or if you want to adjust a combination of color in a certain area, use region filter, but keying is not for this task.

[GrassValley_MD]

Some keyers work well together and others do not at this stage.

Chroma and PiP work fine but Chroma and 3D PiP do not.

We will have to wait and see what happens with this in the future.

But if you follow the good advice given in this thread already you should be fine :)


Mike

[Rusty]

Malcolm,

With a little bit of play you can combine any combination keyers.

With v4.24 Assemble clips on timeline.
1) Apply keyer.
2) Select keyed clips.
3) Right-click>Add to Bin as Sequence>Selected Clips
4) Bring new sequence into timeline.
5) Apply keyer to new sequence.
Repeat as required.

Playtime, Rusty

[Malcolm]

Thanks for the advice everyone.
Still not convinced this is as intuitive as it should be, but if you are confident it is at least possible, that's better than nothing!

Thank you!
M.

[Malcolm]

You want to use color correction for this, narrow down the color spectrum and adjust it, or if you want to adjust a combination of color in a certain area, use region filter, but keying is not for this task.

Hi Khoi,

When you say color correction, do you mean the White Balance filter?
It is the only one which seems to have tools for having an effect on a precise hue, saturation or brightness defined region.

Unfortunately, there is no brightness control, and the contrast and saturation control broken out into black, grey and white is far more complex than is necessary when all you want is to tweak overall saturation of the regions defined by the mask.
Also, the hue selection band suffers from a limitation that does not allow the selection of certain ranges of color because the limit handles do not 'wrap' beyond the extremities of the hue bar.

I do not understand why the color balance filter does not have the same mask defining tools the White Balance filter has. This would do the trick.

The region filter is useless for my needs: a rectangular or elliptical region will never do the job of defining specific groups of pixels to operate upon.

Thanks,

M.

[antonsvideo]

I made a tutorial in version 2, but it still applies now in V4

http://www.videoproductions.com.au/html/edius-chrominance1.html

[Khoi Pham]

Yeah the white balance filter, I have good sucess with it, I normally use "color range" to pick a color then turn on all of "limit function" along with Key display to adjust my range, but maybe you can try Anton's tip, with that you can add YUV or Color balance and adjust your brightness.