Capture source url of downloaded image

I seem to recall that a few years ago, the Mac's "Get Info" box for a downloaded image used to include the url that the image was downloaded from.

I don't see that anymore. Is there a Safari setting that will capture this when I do a "save image as" to download it? Or, must I manually copy the url first, then put it in the Comments box in Get Info myself?

I'm often wanting to capture images that may be useful in my work, but need to be able to contact the source if I decide to use it.

Thanks for any clues.