parasitaere kapazitaeten

I was trying to port shaders from Pd to max, and this is the first result.
I call it pix_alpha, because there is an object in Pd that does exactly this.
you have two thresholds for RGB values and all pixels that are within this value get transparent (alpha is set to the 'pass' value, resp.) and the rest stays visible ('other', resp.)
have a look at the snapshot image (pix_alpha.jpg)!
credits to wes, andrew, vade, rob and josh.
m.