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Can Rotobrush be used with blending modes?

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Rowby Goren
Can Rotobrush be used with blending modes?
on Feb 6, 2012 at 3:06:48 pm

Can I use the shape created by Rotobrush with blending modes?

I'm trying to do it, but blending modes seem to have no effect on the shape created by Rotobrush. Specifically Multiply.

If I have a solid color behind my video all I am able to get to show is the solid color.

In the below example, the solid is red.



Thanks!

Rowby

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Dave LaRonde
Re: Can Rotobrush be used with blending modes?
on Feb 6, 2012 at 5:53:09 pm

If you have the rotobrush the way you like it, you can use the rotobrush video layer as an alpha matte for a solid in a nested comp. The result: a solid that is shaped, feathered & moves like your original Rotobrush. Add it to your main comp and do whatever you want with it... which I presume is changing the shirt color although you don't say.

Dave LaRonde
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA


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Rowby Goren
Re: Can Rotobrush be used with blending modes?
on Feb 6, 2012 at 6:15:50 pm

Hi Dave,

I would like the matte created by Rotobursh to "become" a mask so I can combine the current texture of the fabric with the underlying color of the solid using blending mode.

In the video tthe actor is wearing a white napkin under his chin, which for continuity sake needs to be changed to a blue color closely matching the blue jacket he is wearing.

Because the napkin is mainly white I can't use the replace color effect, and I really don't want a solid color to take its place -- which is what I am currently getting with rotobrush.

I like the perfect shape that Rotobrush created (much more precise than I can do with the pen tool.

Also I see this in the Rotobrush documentation, which could be part of the answer to my question:

"You can copy Roto Brush Path properties, and paste them into masks, shapes, and instances of the Paint effect, just like you can with other kinds of paths. If you copy an individual stroke, the Roto Brush span information is not copied; however, if you copy the entire Roto Brush effect instance, it includes the Roto Brush span (and base frame) information."

If the answer to my question lies in the above documentation, what precisely to I copy in the rotobrush properties and where exactly do I copy those to in a mask.

I tried coping the entire Rotobrush object and then pasteing them into a mask I created but all it appears to do is copy another instance of the rotobrush.

Thanks for any help -- I hope I can use the great shape created by Rotobrush to handle the blending mode that I want to achieve. The sequence is about 5 seconds long and I'm not having great results with just using the pen tool.

Thanks

Rowby

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Dave LaRonde
Re: Can Rotobrush be used with blending modes?
on Feb 6, 2012 at 6:25:54 pm

I don't think it's necessary to jump through all those hoops for 5 seconds of video. Use the nested comp I described earlier as a track matte to limit the Change Color or Change To Color effects on the NON-Rotobrushed footage. The bottommost layer would be the same video. Done.

Dave LaRonde
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA


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Rowby Goren
Re: Can Rotobrush be used with blending modes?
on Feb 6, 2012 at 6:42:49 pm

I'll try it but I've been told that Change to and color change don't work on colors that are mainly white (the color of the napkin).

For example, when I tried to use the Change to / Color Change on the white napkin, using the eyedropper I barely saw any color change at all -- because (I was later told) the napkin color was white.

I love the power of after effects And I appreciate the help I'm getting on this forum.

Rowby

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Dave LaRonde
Re: Can Rotobrush be used with blending modes?
on Feb 6, 2012 at 7:35:32 pm

Then just use the nested comp I described earlier with rotobrush-shaped solid. Use it in the main comp to colorize the shirt. You can use blend modes and opactity to get there, and tweak the color of the solid with the Fill effect, Hue/Saturation... whatever.

Plenty of ways to skin a cat in AE.

Dave LaRonde
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA


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Rowby Goren
Re: Can Rotobrush be used with blending modes?
on Feb 18, 2012 at 6:59:05 pm

Hi Dave,

I know you suggested I use a nested comp to "turn" the rotobrush into an alpha matte to then use with blend modes to colorize the shirt....

Not completely familiar :) with nested comps, I exported the rotobrush results as an alpha channel into a quicktime animation millions of colors file.

Can I use the quicktime animated rotobrush as a matte to use with blend modes?

Please take a look at this video link. The napkin area is black and the surrounding area is white. Can I use this to do the blending mode?






Thanks!

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Rowby Goren
Re: Can Rotobrush be used with blending modes?
on Feb 18, 2012 at 7:52:22 pm

To clarify,

I want to change the "napkin" area to approximately the color of the Jacket.

Currently in the original video the napkin is white and has some folds in it which I want to retain. I want to blend the napkin with a dark blue solid color (blend mode) and then use the results on my video.

I assume I will be able to use the resulting matte of just the new colored napkin on top of the video layer to "cover up" the existing white napkin.

I am only adding this comment to make clear that I am not colorizing the existing blue jacket -- just the existing white napkin :)

Rowby

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Rowby Goren
Re: Can Rotobrush be used with blending modes?
on Feb 8, 2012 at 11:08:53 pm

Sounds good. I'll try it and report back!

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Rowby Goren
Re: Can Rotobrush be used with blending modes?
on Feb 19, 2012 at 1:55:52 am

Hi Dave,

Re-reading your original post I think I am starting to "get it".

But I am stumped at where you say "....use the rotobrush video layer as an alpha matte".

I don't specifically see a "Video layer" in rotobrush. I see where I can "Toggle Alpha" and then I see the solid white shape that rotobrush created". But I don't think that is what you meant.

Here's a link to what I have so far.... It's the rotobrush of the napkin.... I want to blend the napkin color with a dark blue solid that I assume I would put under the rotobrush result







Rowby

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Rowby Goren
Re: Can Rotobrush be used with blending modes?
on Feb 19, 2012 at 2:41:47 am

Hi,

Sorry for this drawn out thread...

But just to be completely clear here is the original footage where the white napkin exists. I want to use my rotobrush results to blend the napkin with a solid color underneath, and then use those results to layer on top of the original footage so the blended color takes the place of the white napkin.

:)







The footage in question starts with the wide shot that follows the two-shot.

Rowby

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Rowby Goren
Re: Can Rotobrush be used with blending modes?
on Feb 19, 2012 at 5:04:06 pm

Here's my latest attempts using the following settings:






and for a closer look:






Attempt to replace napkin with dark blue blend.

Any suggestions on how to improve the edges -- and any other suggestions for improvements.. I want the folds of the napkin to show -- to keep it from just being a "solid".


Settings: Rotobrush
Rotobrush matte:
Smooth 2..0
Feather 0.0
Choke -60% (note minus)
Reduce chatter 100%

Any way to improve the edges?
Refine matte On
Motion blur off
Decontaminate edge colors off

Using Luma Matte and Multiply blend mode in After effects

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