B/W mask?

I don t understand how to get the mask shader to let the colors of the incoming texture through…
see attached patch

masktest.rar (16.5 kB)

looks like there is something wrong in mask shader, use lumakey shader instead.
set it trsh low to 0.0 up to 0.3 and tech to luma mask, not sure where that shader come from, think it’s just a copy of original lumakey from vvvv legacy site.

Luma Key Ant .fx (3.8 kB)

Thanks that worked !