Cycling 74 » Topic: using images for masking in several layers??? http://cycling74.com/forums/topic/using-images-for-masking-in-several-layers/feed Wed, 19 Jun 2013 09:06:39 +0000 http://bbpress.org/?v=2.2.4 http://cycling74.com/forums/topic/using-images-for-masking-in-several-layers/#post-34545 <![CDATA[using images for masking in several layers???]]> http://cycling74.com/forums/topic/using-images-for-masking-in-several-layers/#post-34545 Fri, 09 Nov 2007 23:11:56 +0000 mr.l Hi everyone,

I am trying to layer 4 different movies in one window. Is there a way to give each one of them a different mask (I want to use shapes prepared in a black and white image for masking) so that one part of each movie is visible (the white part of the mask) and the other part (the black part of the mask image) is transparent. I tried several things for the mask (with jit.op; jit.alphablend etc, jit.gl.slab) but once I layer the images in a videoplane or a matrix the black part is never transparent to see the movie underneath. The goal is to have all 4 movies running continuiosly but change their visible parts by changing the mask-shapes (the visible part of the first movie however would cover the second one and so on…).
I hope I made the problem clear :)

Thanx a lot…

]]> http://cycling74.com/forums/topic/using-images-for-masking-in-several-layers/#post-116806 <![CDATA[Re: using images for masking in several layers???]]> http://cycling74.com/forums/topic/using-images-for-masking-in-several-layers/#post-116806 Fri, 09 Nov 2007 23:20:42 +0000 Andrew Benson You will need to apply the mask to the alpha channel of your image
(plane 0 of the matrix) and then use jit.alphablend to do the
compositing. For an example of one way to apply alpha channels, look at
the AlphaToast recipe in the Jitter Recipe Book.

Best,
Andrew B.

]]> http://cycling74.com/forums/topic/using-images-for-masking-in-several-layers/#post-116807 <![CDATA[Re: using images for masking in several layers???]]> http://cycling74.com/forums/topic/using-images-for-masking-in-several-layers/#post-116807 Sat, 10 Nov 2007 08:03:23 +0000 nathaniel.stern Another option is to use jit.op @op *, with the video you want in the
left channel, and your grayscale image (or video) in the right. I
usually use this instead of the alpha channel to great effect, tho
I’m not sure if it’s faster or slower….

nathaniel

http://nathanielstern.com

On Nov 9, 2007, at 11:20 PM, andrew benson wrote:

> You will need to apply the mask to the alpha channel of your image
> (plane 0 of the matrix) and then use jit.alphablend to do the
> compositing. For an example of one way to apply alpha channels,
> look at the AlphaToast recipe in the Jitter Recipe Book.
>
> Best,
> Andrew B.

]]>