I kindly ask for help on the topic of reading image data from stdin (in a python program). I have tried something like

    source = pyvips.Source.new_from_descriptor(sys.stdin.fileno())
    img1 = pyvips.Image.new_from_source(source, '')

but this does not succeed. Probably I need to provide more information about the image data (which loader to use?) to the program. Or use another approach?

I am aware of this article but failed to adopt it. I must confess that I am a both a newbie on libvips and not very familiar with python coding either ...

Would be great if you could provide a simple example.
Thanks in advance.