babette

i am trying to get a shader to work, which simulates a luma key

i want to get the black areas of my videoplane transparent.

i tryed the [jit.gl.slab foo @file co.lumakey.jxs], but i did not

get it to work and i can not find a help file for co.lumakey.jxs ...

i am trying to get a shader to work, which simulates a luma key
of an analog mixer.

i want to get the black areas of my videoplane transparent.
(scalable with tolerance)

i tryed the [jit.gl.slab foo @file co.lumakey.jxs], but i did not
get it to work and i can not find a help file for co.lumakey.jxs ...

here is my testpatcher.
perhaps someone can give me a hint :-)


need-help-with-luma-to-aplpha-shader

that solved the problem !
thanks a lot for the help :-)


I'm sort of doing something similar (but I think simpler) in mine I'm drawing my 'black' area using lcd so it's an known factor and it's that I want to make transparent rather than everything that is black in the videoplane - it's a set mask. I've found a few examples on the forum that do this but all the ones I've found don't seem to make the videoplane itself transparent (this example above is closer in that it does that). Anyway below is what I have combined with the above but of course if you play a video with black it's not right. Can anyone point out what I should be doing? Thanks.

I'm sort of doing something similar (but I think simpler) in mine I'm drawing my 'black' area using lcd so it's an known factor and it's that I want to make transparent rather than everything that is black in the videoplane - it's a set mask.  I've found a few examples on the forum that do this but all the ones I've found don't seem to make the videoplane itself transparent (this example above is closer in that it does that).  Anyway below is what I have combined with the above but of course if you play a video with black it's not right.  Can anyone point out what I should be doing?  Thanks.

need help with luma to aplpha shader