removing border jags

how to remove that outline ? :frowning:

Is this a composite? Did you render you black figures without OSA or too low a setting and rendered them premultiplied using a white background?

this happens before the compositing , yes white background .

I’ve had the same problem before too. I don’t know exactly what I did off the top of my head, but you can try using full oversampling instead of the regular oversampling. That will antialias the picture after the composite is done.

There are a ton of things you can do to get a better mask when separating elements in an image. What program are you using? If it’s photoshop I can give you many suggestions.

Then maybe don’t premultiply?

Then maybe don’t premultiply?

what is premultiply ?

solved , i was enabling Ztransp on the snow field .