Compositing 101: The Black edge


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The black edge...that faint line of premultiplied colour can be a devil if nobody has ever shown you how to get rid of it.



Here is your frame turtle_0034



Here is your background sea footage:



The problem is this horrible faint black edge that you can't seem to get rid of:




If you are compositing it for animation you need to select premultiplied when you import the frames into After-effects or whatever compositer you use.



If you are using Photoshop then in the Matting sub-menu there is a remove black matting tool found under layer....



If you do want to know where premultiply is in your render....

Maya software render:



Mental Ray render:



then you have happy turtles:





To those wise experienced compositors...take a moment to share some wisdom...there are a million tuts on how to create scenes and precious few to show you how to assemble them properly....


-andrew

www.dotnamestudios.com
andrew@kerr.name