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I finished my work and I want to render everything. The object and the background. I use the nodes to cast a shadow on the background image. I did this thanks to a tutorial on youtube. But the guy doesn't show how to save or how to render this final image made with the nodes.

Here are my nodes with the final image in the background and the result I'd like to get in my render:

enter image description here

Here is the result I get when I press the Render button:

enter image description here

As you can see, it only rendered my renderlayer, which contains the mesh plane and the strange rock and that's not what I want...

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  • $\begingroup$ The node labeled "composite'' is yous final output. It should be connected to the same mix node as the viewer. $\endgroup$ – cegaton Dec 22 '15 at 14:31
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Connect the last node in your tree of nodes to both Compositor node and Viewer node, because the node which is connected to either Compositor or Viewer will be one acessible for preview in result.

Basically, Viewer allows you only to preview the result which you're working on, while Compositor will make this result to be actually rendered.

enter image description here

At the moment you have your original image connected to Compositor node which is why you get that not expected result. Also you have your composited image connected to Viewer node, and that's why you can preview eveything nicely.

Read more on difference between these nodes in wiki or in this related question: What is the difference between Viewer and a Compositor node.

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In addition to Mr Zak's answer you also need to change the Image Editor view to display the composite. Currently you are only looking at the raw render result. Change the dropdown menu at the bottom of the view from Render Layers to Composite to see the compositing result.

enter image description here

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  • $\begingroup$ Can't believe that I could miss that. Thanks for adding! $\endgroup$ – Mr Zak Dec 22 '15 at 15:23

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