making an alpha from difference

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  07 July 2003
making an alpha from difference

i'm trying to make an alpha from an image made by blending two pictures with the difference mode.(the photo is two identicle camera angles of a room, one empty, and one with people) i applied the resulting difference image to an objects transparency map, and had the alpha options set to surface alpha was produced but because of the way i did it it made a grayscale of the difference image.what i want is pure black and white in this case. is there a better way to go about doing this?and instead of applying images to surfaces is there a way to do this just using the texure filter plugin in the image editor? i am doing this just to see what lightwave can do in compositing, not for a specific project.
  07 July 2003
hmmm... not much response, well i'll make it more there a way to take a grayscale alpha and make it completely black and white?
  07 July 2003
Eki's LW compositing tut

Hot off the presses, discusses pulling mattes using Texture Filter.
Court Jester
Now playing at EdenFX
  01 January 2006
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