[pornel]

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.

[nebalee]

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

[pornel]

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

[tomsander1998]

please tell us if it worked!