Blend mode - removing halo around edge of alpha??

[Playdo]

This is a complicated question so I'm hoping there are some real 'Gurus' here.

I have a final image of my image to which I want to apply an alpha as a mask of an adjustment layer.

The image and the alpha have come out of 3ds Max. The problem is that there is a halo around the edge of the mask. This is caused due to transparency at the border of the alpha. I don't know how to get around this.

I was told that there may be a way to do it by dividing the alpha. I see that Photoshop CS5 has a divide blend mode. I don't have CS5. Does anyone know if this solves this issue? Or any other solutions

I've attached the render passes that I'm working with.

(www dot) fileswap.com/dl/LQmX9s/Passes.zip .html (fix URL-couldn't post)

 

[Steve]

Hi Playdo and welcome to PSG.
This isn't a PS issue I can help you with but I can help you by attaching the files for you.

These are the files from Playdo's link.

 

[Playdo]

Thanks for that Steve.

If you wouldn't mind linking this image too. It shows the issue that I'm having:

http :// i919.photobucket.com/albums/ad34/elaihphotography/Example-CloseupObjectIDHalo. jpg

 

[Steve]

Your welcome Playdo.
We have a lot of knowledgeable people here and some are incredibly talented.
I hope they can help you out.

 

[Steve]

Thanks for that Steve.

If you wouldn't mind linking this image too. It shows the issue that I'm having:

http :// i919.photobucket.com/albums/ad34/elaihphotography/Example-CloseupObjectIDHalo. jpg

Here the example image.

 

[$1r_M4x1mu$]

Hi Playdo welcome to the forum.

The way a see it we are talking about layer masks and selections here.

In order to eliminate the white halo that you are talking about in photoshop:

- What you need to do is load your rendered image
- And then load also your alpha layer on a new layer
- Load your alpha layer as layer mask.
- create a selection using layer mask
- Once selection loaded just go to Selection>modify>contract "1 pixel"
- then go to layer>new>new layer via copy
- done

This could help
layer masks
How To Use Layer Masks And Adjustment Layers In Photshop

and selections
Photoshop CS5 - Selection Tools

also uploaded masked selection as PNG if this helps

* I know, it seems more difficult than it really is, but keep in mind
you need to modify your selection once is loaded
so you can make it bigger or smaller