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Does this watermark still work if someone screenshots an image?

Yes. The data is embedded in the pixels of the image, and it's embedded in a way that survives recompression of the image and some editing.

Does it still work when I take a photo of the screen with a camera?

please tell us if it worked!

Maybe. It depends how strong the watermark was, and how good the photo was at reproducing the image.

try running the code to find out