Alpha / transparency issues

[asher]

Hello,

I find that when rendering with premultiplied alpha, the render has "edges" that keep the colour of the Octane sky enviroment. This prevents compositing, were after inserting on say, Photoshop, another background, the edges are painfully obvius. The keying should be fading to pure transparent, not the colour of the sky. Is there something wrong that i am doing? Any other way of saving the image with correct alpha?

[FrankPooleFloating]

You are definitely doing something wrong. Octane produces flawless alphas on everything I render. Everything. Maybe send a scene to Juanjo...

[asher]

if you unclick "keep enviroment" on kernel, edges are ok, no more blue edges" but only with a lense of cero field , the moment you add depht of field, you get even a worse result

[LightwaveGuru]

if you unclick "keep enviroment" on kernel, edges are ok, no more blue edges" but only with a lense of cero field , the moment you add depht of field, you get even a worse result

BTW

the same issue is happen if you have objects with (for example) image seq with alphas inside from TFD Volumes.
Than you see the outlines from the geometry inside the TFD Volume...so you can not mix at time TFD with objects image seqs.
for example a Engine with a image seq. for the fire and TFD for the smoke.

snip lwguru