Extract external image in layers & Color path

Hi there!
I am new here, i am portuguese, i am 22 years old, and to finish my multimedia engeneering course i have choose a computer animation.
That computer animation is a join of a scenario made in sketchUp&Cinema4D and the animatio made in Reallusion iClone.
Well, to join the two different parts i have choosen AE software (actually is After Effects CC) and i have two questions that i cant find the answer:
1º: Well, as i said the animation and scenario are in a different project, and i have joined both in AE. But the scenario is not always just a landscape. Sometimes is a building that the actor walks on it, so i have (in some way) to put the actor "in" the building, and if i was working with images i would easly solve that problem: select and extract to another layer what i want to be in first place, or to be the landscape. At the same logic, how can i do this in After Effects CC?Can i extract some objects by color as i can do in Photoshop?
2º For storytelling reasons, i would like that , in some moment, everything turns gray , and the actor is colored. but there's more! i would like that the actor leaves a colored path (the path that he is taking in animation). Is there any way that i can do it?
If i cant do it, i have to re-build the entire animation in Cinema4D.
Thank you very much!
Peace

Hi
Well, i have another problem, that i can´t find soluction on the internet
For not being one month rendering the scenario form cinema4D i´ve choosen open it in the after effects with a plugin called "CINEWARE" that opens the cinema4D project inside the After Effects project.
As you recommended it, i am using roto brush tool.
Well, with a video, i can use that tool, but with cinema4D project i can´t!
Do you know why?
Do i have any sollution beside render all the scenario in cinema4D?
Thank you very much (and sorry for the bad english)

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Andy Tauber
Data Architect
The Vancouver Clinic
Website | LinkedIn
This posting is provided "AS IS" with no warranties, and confers no rights. Please remember to click
"Mark as Answer" and "Vote as Helpful" on posts that help you. This can be beneficial to other community members reading the thread.

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ty

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I found another way, which is using ROIShape class as mask.
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Apparently the resulting image form and "add" between a oneband and a 3 band image is not supported.
Also, if I do convert the one band image to color, it does not solve the problem
ColorModel colorModel = cropped.getColorModel();
pb = new ParameterBlock();
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maskimage = JAI.create("colorconvert", pb);
What would be the right way to do this ?
Thanks
trace:
image mask bounds=java.awt.Rectangle[x=250,y=250,width=500,height=500]
cropped image bounds=java.awt.Rectangle[x=250,y=250,width=500,height=500]
subimage image bounds=java.awt.Rectangle[x=250,y=250,width=500,height=500]
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at com.sun.media.jai.opimage.AddOpImage.computeRectByte(AddOpImage.java:268)
at com.sun.media.jai.opimage.AddOpImage.computeRect(AddOpImage.java:220)
at javax.media.jai.PointOpImage.computeTile(PointOpImage.java:974)
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at sun.java2d.SunGraphics2D.drawRenderedImage(SunGraphics2D.java:2751)
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Support Resolution/Color(CRT)
640x480 16bit/32bit colors(Depending on CRT)
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1024x768 16bit/32bit colors(Depending on CRT)
1280x1024 16bit/32bit colors(Depending on CRT)
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1600x1200 16bit/32bit colors(Depending on CRT)
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[svn:fx-trunk] 11376: Remove external image support from BitmapImage and BitmapFill.

Revision: 11376
Author:   [email protected]
Date:     2009-11-02 11:39:44 -0800 (Mon, 02 Nov 2009)
Log Message:
Remove external image support from BitmapImage and BitmapFill.
QE notes: none
Doc notes: ASDoc updated. Any other docs that mention loading external images in BitmapImage, BitmapFill, or Border need to be updated.
Bugs: none
Reviewer: Jason
Tests run: checkintests, cyclone
Is noteworthy for integration: Yes
Modified Paths:
    flex/sdk/trunk/frameworks/projects/framework/src/mx/graphics/BitmapFill.as
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AngryCloud posted in macromedia.dreamweaver:
> I have a PNG image of a black silhouette graphic with
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>
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Monika Gause wrote:
rijackson741 wrote:
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Extract external image in layers & Color path

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