Excuse me, I misunderstood the question. Usually, when rendering, the image can be saved with F3 or through the node's "File Output", with a name of the form "ImageXXX", according to the frame number. I want to have anything instead of ImageXXX - the name of the selected object, material, and so on. In this particular case, I want the name of the "Bevel Object" selecter curve, to be recorded in the name of the output image.
1 Answer
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If I got what you mean, you need to edit this property,
https://docs.blender.org/api/blender_python_api_current/bpy.types.NodeOutputFileSlotFile.html
this string will be the prefix for output to image from that node, as you see below:
Of course you need to know the name of the object, as you say, but I guess this is quite easy...