How can I fetch pixel coordinates without a loop

2007_000032
I want to extract the coordinates of the colored pixels without a loop.

You should be able to identify the colorized pixels by identifying their respective values.
Say the dark red corresponds to a value of 1.0.

Then you can get the indices of red pixels this way:
indices = torch.nonzero(image==1.0)

Thanks!
I can try your method.