White color to alpha

Jitter
Benjamin N's icon

Benjamin N

Hi every one,

I'm tring to achieve the following things :
- have an image in black&white, as you can see in enclosure.
- detect white color
- replace white by alpha channel (or other color) / and inverse : replace black by alpha channel
- send it by syphon with alpha channel

I'm trying to achieve this with slab and alphaglue, but it's doesnt work as expected.

If i can do this in gl, it would be perfect!
Do you have any idea ?

Thanks!

Benjamin N's icon

Benjamin N

Here is the patch

gobotest.maxpat
Max Patch
telematique's icon

telematique

Max Patch
Copy patch and select New From Clipboard in Max.

if you are on max6, you could use jit.gl.pix.

Benjamin N's icon

Benjamin N

I'm a Max 6 user,
And i'm very happy !

Thanks a lot!

To go further, do you (or other!) it is possible to replace white or black by a variable color ?
like [matrix 4 char 1 1] to go inside ?

Thanks again!