lee wang

i am trying to generate an alpha mask from an greyscale movie

white should be opaque, black should be black.

it should look like, if i use the blendmode 0 3 (which is multiply)

but in this blend_mode, i can not blend anymore.

if i use blend_mode 6 7 and the "co.lumakey.jxs" shader, i can blend, but the keyed greys are looking bright.

perhabs a lumakey shader with shader with multiply blend_mode ?

i am trying to generate an alpha mask from an greyscale movie
and i want to blend it.

it should look like, if i use the blendmode 0 3 (which is multiply)
but in this blend_mode, i can not blend anymore.

is there an other solution
perhabs a lumakey shader with shader with multiply blend_mode ?

luma-to-aplha-in-gl-land

You just need '@depth_enable 0' on your videoplane and it should work.

it only helps with the max6 versus max5 incompatibility.

i have attached a patch, which should work on both versions.

to see the difference, click on the "blend_mode 6 7" and the "blend_mode 0 3" button.

thanks for the answer.
depth_enable 0 is not the problem.
it only helps with the max6 versus max5 incompatibility.
i have attached a patch, which should work on both versions.

OK, there is no difference for me between the blend modes, your patch seems to work as I would expect.

Anyways, the help patch for composite shaders should help you:

Max6/examples/jitter-examples/render/slab-helpers/composite.shaders-help.maxpat

an my machine the "blend_mode 0 3" is much darker "blend_mode 6 7"

i am on mac osx 10.6.8, MacBookPro8,2 with AMD Radeon HD 6750M gpu.

an my machine the "blend_mode 0 3" is much darker "blend_mode 6 7"
i am on mac osx 10.6.8, MacBookPro8,2 with AMD Radeon HD 6750M gpu.
max5.1.9 and max6.0.4

OK, sorry, I can see the difference now, but it does look slight on my display. Does this help:

thank you very much for looking into my patch and wast your time ;-)

mixing the 2 layers with a shader is not an option for me.

i am working on a very big patch, which has to be finished the next days.

the co.subtractive.jxs shader is boosting the colors.

i am searching for possibility to create a neutral mask from a greyscale movie. (like the blend_mode 0 3")

mixing the 2 layers with a shader is not an option for me.
i am working on a very big patch, which has to be finished the next days.

btw
the co.subtractive.jxs shader is boosting the colors.

luma to aplha in gl land