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I have a custom node and I want it to be able to display an image. I know that the node has a parameter show_preview and if you enable it, no image appears.

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Are you trying to load a camera preview as an image? As your code suggests, you don't have any image selected and loaded to get a preview from.

You can use:

for i in bpy.data.images:
    print(i.name)

to verify that you actually have an image in memory.

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