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Either using Cycles or Blender Render - Need to match the depth of field on an object to a background image. Basically, I want to have a background image (that has DoF in it by itself), mapped flat on the background, and then a 3D object with matched DoF - so the DoF is only applied on the 3D object but NOT on the background image. Any hints welcome!

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  • $\begingroup$ Not sure if there is really a way to do this besides eyeballing it.. $\endgroup$ – gandalf3 May 6 '15 at 7:05
  • $\begingroup$ I'm not asking for automation - the problem is that the DoF gets applied to the background image aswell, but I want the background image to be excluded from it because it has DoF already in itself... $\endgroup$ – riccardolardi May 6 '15 at 7:17
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If you enable Transparent under Film, then the background of the rendered image will be transparent, allowing for it to be easily composited with another image:

enter image description here

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