LAB color space equivalent in AE?

[Rona Gales]

I will suggest you to contact Adobe with your ramp problem.

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Do you not read “filter effects”? Luminance blending mode is not the same as Y in YUV

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[Darby Edelen]

[rona gales] ” I will suggest you to contact Adobe with your ramp problem.

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Do you not read “filter effects”? Luminance blending mode is not the same as Y in YUV”

I did not intend to present the Ramp example as a problem I was having. I was suggesting that you try it, so that you could see that the HDR Compander effect is not a viable solution in some cases.

Thanks for the suggestion, but Adobe is already aware of the limitations in HDR Compander.

Is “filter effects” a blog? I have not read it, but I stand by my recommendation of the Luminance blend mode for the original poster’s purpose. I can think of a couple reasons why it would be preferable over using Channel Combiner:

-It’s 8bpc.
-To access only the Y component an effect has to be able to operate on channels individually.

Darby Edelen

[Rona Gales]

I don’t have the “ramp problem” on my system!! Good luck to you and Adobe

Adjusting Curves effect in YUV is not the same as adjusting Curves effect with luminance blending mode. The weight of the color in YUV is different and you get softer whites and a lot better color reproduction.

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[Darby Edelen]

[rona gales] “Adjusting Curves effect in YUV is not the same as adjusting Curves effect with luminance blending mode. The weight of the color in YUV is different and you get softer whites and a lot better color reproduction.”

Yeah, you do get different results when using color correction effects. Especially the saturation of the colors.

If the original poster is used to making channel color adjustments in Lab then YUV may be a better model to follow as it behaves more like Lab. I should have recognized that in the original post.

I usually prefer to adjust the luminance of the image without affecting the color at all, and then adjust the color if I need to, but that comes down to a personal choice. We’ll agree to disagree.

Darby Edelen

[Rona Gales]

With “Luminance blending mode” you are affecting the color slightly and not with Y/ L

If you adjust the Y curve only with:
CC composite RGB to YUV
Y=R curve only
CC composite YUV to RGB
You will get softer highlights and better color reproduction.

If you adjust RGB curve only with:
RGB curve only (not the R curve, G curve and the B curve )
Luminosity blending mode
You will get harsher highlights, slight lost of saturation and sometime a slight hue change too. You should do some test with skin tone for example….

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[Jim Arco]

Jim,

I haven’t found a way to work with Lab color space inside of After Effects. However, you can open your video in Photoshop, convert to Lab, and apply filters. After you save the PSD, you can import it to AE and the filtering done in Photoshop remains intact. (No need to change back to rgb.)

This works great for those times you need to make broad changes to luminance or to color. Also, little surface blur applied to the a and b channels can be used to get rid of some types of noise. If you modify the Photoshop file, you need to right-click on the footage and reload it in AE.

Jim

[Rona Gales]

YUV is not exactly the same as LAB but Y/L it is very close….

You are converting back to RGB and “merging the layers” automatically with After Effects when you import the PSD files if the color mode is not RGB….even if command E get you back to LAB mode in Photoshop.

Yes we all do round trip to Photoshop too but keep in mind that some effects and plugins don’t carry over After Effects. Then it’s render time:)

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[Rona Gales]

Also you may find it hard to go back to the original PSD after you’ve made changes in AE. The AE changes don’t carry over to PS… You may end up going back and forth and second guessing the new changes….

And you need to RE-save the PSD file before you can reload the footage in AE.

The God Of Color Of The Universe Will Rise Again!