masks and alpha channels


New member
this may be a dumb question but i haven't been able to find how to do this. I have a blue screen shot that needed lots of roto work to fix where there wasn't the blue screen. so I used my loader and did a couple of trackers to help with the roto work and got it all set up. then put the chroma key on and when i look at the alpha the alpha doesn' t have the masks as transparent. the two pictures below show what's going on. I had this problem before and moved my masks to the chroma key and that worked, but I need to figure out how to do it this way. Because some times I do a luma key then a chroma key and the alpha doesn't come through. the luma looks right, but when I put the chroma key on it just shows the alpha from the chroma key. Like in After Effects if you did a luma then another type of key your alpha would be affected by both. it's probable something simple but I can't figure it out.
Anyway any help would be great.



  • alpha.jpg
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  • masks.jpg
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