Green screen blues

andykarta

So I wanted to see if I can extract the forms I wanted from the rendered picture and assemble them in photoshop.  I set the background to green, to fushia, to lavender... and I can do this with pictures but with rendering it takes a half hour at least to extract something with lots of fine detail like antenna and greeble. It bleeds into the object.  And even after I expand the selection and other stuff, I still get this green (or lavendar) glow which I don't get extracting from actual photographs.  And if I extract to get past the glow the extracted stuff looks extracted too much.  

Does anyone have any best practices for extracting from IRAY or 3Delight.  I once saw a photoshop tutorial where they used channels to extract the right color and it was beautiful.  But I think it has something to do with one of the many many things in the surfaces tab I don't understand like specular light opacity or higgs bozon particle flux or whatever. Or maybe a render engine setting.   Any help would be appreciated.

MelanieL

I render without a background (draw dome off in Iray or just nothing except my character/prop in 3Delight) then save the render as a .tif (or .png I suppose) - in Photoshop it will appear with a transparent background so you can layer it on top of your other renders/photographic backgroung/whatever.

andykarta

MelanieL said:

I render without a background (draw dome off in Iray or just nothing except my character/prop in 3Delight) then save the render as a .tif (or .png I suppose) - in Photoshop it will appear with a transparent background so you can layer it on top of your other renders/photographic backgroung/whatever.

You rock!!!!!!!!!