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Blending poser animation with alpha background [ANSWER]

Posted: Fri, 3rd Nov 2006, 11:44pm

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mrmouse777

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i created a poser animation with a black background which is creating an alpha for the background. when i import it into compositelab on the time line

i import a seperate background Pic image. i placed that on the time line as well.

shoudln't composite lab auto combine the original image image with the alpha chanal and the background pic together?
or is there a blend funtion which needs to be used???
Posted: Sat, 4th Nov 2006, 12:43am

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petet2

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No that works, I just tried it with an image from Daz Studio (related to Poser and has the same tif with alpha channel image output) and a bitmap image I found on my hard disk. Make sure the Poser image is above the background image on the timeline; i.e.: poser on track 2, background on track 1.
Posted: Mon, 6th Nov 2006, 8:58am

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Cogz

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When you export the image from poser, is it saved in a format which supports 32-bit color? i.e. PNG, TGA, TIFF.

Or, if you have exported the alpha channel as a separate image, you can add the alpha channel image to the timeline, add the poser image to the timeline, selecting the poser image "mask" section. Add an object mask, linking the alpha channel image to that. See the manual for further uses of the "object mask".

If you are still having trouble, let us know, perhaps upload one of your images so we can try ourselves.
Posted: Mon, 6th Nov 2006, 9:06am

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mrmouse777

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I AM MAKING AN ANIMATED MOVIE NOT A STILL IMAGE I AM USING BLACK AS BACKGROUND WHICH CREATES ALPHA CHANAL AND I AM SAVING THE MOVIE AS DVDPRO COMPRESSION WITH QUICKTIME
SOMWHERE ALONG THE LINE I AM DOING SOMETHING WRONG
Posted: Mon, 6th Nov 2006, 10:40am

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Hendo

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mrmouse777 wrote:

I AM SAVING THE MOVIE AS DVDPRO COMPRESSION WITH QUICKTIME
I'm not familiar with that codec, but in order to retain an alpha channel in a QuickTime video stream, you'll need to use a codec that supports Millions+ colours (32 bit).

Try using the 'QuickTime Animation' codec and choose 'Millions+' for the color depth.
Posted: Mon, 6th Nov 2006, 3:53pm

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Axeman

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Using Black as a background does not automatically create an alpha channel. I assume you know this, but wanted to clarify that for anyone else reading this thread.

The DVCPro codec doesn't retain alpha channel information. As Hendo suggested, try using the Quicktime Animation Codec, and you should be good to go.
Posted: Mon, 6th Nov 2006, 5:01pm

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jotoki

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I've used visionlab Studio to do exactly the same thing and it worked fine. the black background to the animation is the way to go. I think i used uncompressed AVI as a codec though.
Posted: Tue, 7th Nov 2006, 12:15pm

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petet2

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Rather than rendering your Poser output as a video can you render it as a stream on consecutively numbered tiff images?

Daz3D Studio which I use (and which I understand is an off shoot from Poser) has this option. Comp Lab will import the image stream which you can then drop onto the canvas. The alpha channel in the tif files is detected automatically to composite your 3D images.
Posted: Tue, 7th Nov 2006, 10:24pm

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mrmouse777

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thank you all

as far as exporting the movie to single images would exporting as png work better than the tif?
Posted: Wed, 8th Nov 2006, 9:27am

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Cogz

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As far as I know there isn't much difference between the quality of PNG or TIFF image types. They both can be lossless, so either would be okay.
Posted: Thu, 9th Nov 2006, 9:28pm

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pixelboy

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Or...You could just do what I do and render with a green/blue background and key it in CLab.
Posted: Sat, 11th Nov 2006, 1:59pm

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petet2

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You have to be careful with the edges of your rendered subject if you use a chromakey background as the antialiasing within Poser/Daz Studio can blur them with your background colour. This can make it more difficult to get a clean edge to your keyed image.
Posted: Sat, 11th Nov 2006, 5:15pm

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mrmouse777

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thank you.

i used pure green rgb 255 and 0 for all others as a rendered background. there wassome green spill . i changed the white point that eliminated it but if you go to far you can lose parts of your image
Posted: Sat, 11th Nov 2006, 8:16pm

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pixelboy

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A "Spill Supression" filter can be helpful with that, so you don't have to take the white point so far.