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I have a small problem with my blender lately. I want to make some compositing with my compositing nodes but the problem is, blender won't show me the preview Image. I have a Screenshot for you guys.

enter image description here

The preview Image itself is enabled, but it just won't show.

Thanks for your help in advance!



marked as duplicate by gandalf3, Ray Mairlot, GiantCowFilms, CoDEmanX, David Aug 13 '14 at 15:24

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • $\begingroup$ Have you rendered your scene? (F12 or the camera button on the renderlayers node) $\endgroup$ – gandalf3 Aug 13 '14 at 7:49
  • $\begingroup$ @gandalf3 oh no! Is it necessary to do so? ... I am sorry, but I am new to Nodes. $\endgroup$ – Marten Zander Aug 13 '14 at 7:54
  • $\begingroup$ Yes, otherwise the compositor nodes don't have anything to operate on (unless you add another input source besides the renderlayers node). $\endgroup$ – gandalf3 Aug 13 '14 at 7:57
  • $\begingroup$ @gandalf3 btw, I read the other post about the preview Issue, but there was a white X and in my Case there was no white X so I thought it must be something different. But well, it worked so, thanks! $\endgroup$ – Marten Zander Aug 13 '14 at 8:31
  • $\begingroup$ The white X only appears when the viewer node is selected. $\endgroup$ – gandalf3 Aug 13 '14 at 18:25

You need to render the scene before anything shows on the compositor. HitF12 or press Render. enter image description here

To have the Viewer Node's image as background behind the node tree you need to enable the backdrop button:

enter image description here

If you press N on the Node Editor's window you'll see Controls for size and placement of the backdrop:

enter image description here

Or you can zoom in and out by pressing V or ALTV

You can also choose to see the Composite Node or Viewer Node in a UV/Image Editor window. Selecting Render Result will display the Composite Node

enter image description here


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