background color for masking

#1

I apologize for the complete simplicity of this question but I must be extra dense today. I have my diamond head model and I need to export a video of him with a bright blue background so I can chroma key mask in final cut. When I set the background color it taints the semi transparent color of his body. Anyone have the quick fix method of setting a background color for chroma key mask purpose later without interacting with the objects in the scene. A render setting I am missing?

#2

You don’t need to do a blue background to chroma key it.

Render your animation into a TIFF32 or TGA32 sequence which will also embed the alpha channel so that your background will be transparent when you import it into your editing software.

#3

As above plus you ideally want to set the background to something similar to what you’re planning to overlay in Final Cut otherwise it won’t match very well.

#4

I ended up with an avi. and a crapload of images one set is the rgb (each frame of the movie I assume) and one is the black background (alpha) I assume. IS that it? So I suppose I can use all those frames somehow with the movie editor software. RGB 1-120 and Alpha 1-120. I will try to figure it out.

Also I get some artifacting along the bottom of my redered avi? this is on all my renders. Any ideas? here is sample.

1.zip or 1.avi

http://hulasoft.com/eat/3d/1.avi 4Mb
http://hulasoft.com/eat/3d/1.zip 1.2Mb

Thank You guys I appreciate it you can tell I have no idea what I am doing but it is fun.

#5

uh, im not entirely sure what you need, but if you click on the object, go to the render tab and put the alpha channel to constant black then your animation (Saved as .tga or similar) will have a nice alpha channel inbedded which any comping software will read and you can replace the bg with no problems!

Hope this helps.

SK

#6

In FCP … Just right click your clip and choose Item Properties, then right click on the alpha-channel mode and select Black … Then the alpha will be top notch …

#7

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