How to remove halo effect in Alpha channel?

[martincozl]

Hi, could someone help me?

I tried to use Alpha layer rendered scene (with transparent background) from Sketchup as a mask layer in Photoshop, but there is some white halo effect around rendered objects.

I had to edit in the same way as in this tutorial- http://www.lynda.com/Photoshop-tutorials/Removing-halos-Darken/48372/51450-4.html

Is there any way how to render correctly - Alpha vs. RGB model?

 

 

Can be this problem solved by atialiasing?

My settings of antialiasing is in attachement.

 

Thank you for help.

[Chris MacDonald]

try going to layer/matting/defringe or remove black/white matte. You might have to apply your alpha channel to the layer to do this though.

[RyderSK]

What Chris said, plus working with selection mask refinement.

 

But what you should have done in rendering, is to render against black background, without any additional AA filter.

[Tommy L]

Try to preserve your alpha, you never know when you might need it...

Go to 'refine mask' in the selection dropdown. you can offset it inward by maybe a pixel, then feather by .2 pixel, have a play around with the settings.