Allowing watermark on the background

[PrzemyslawKlys]

This would give some protection against image theft

Linked to: #3

[vexx32]

would we want the watermark on the background only? Or superimposed across the whole image?

What would the functionality look like? Are we expecting like a tileable transparent overlay to go over the whole image? Or just over the background? Single images / bits of text to overlay?

Is the user expected to input a path to an existing file, or just a string of text? Both, maybe?

[PrzemyslawKlys]

I guess having a transparent overlay over the content would be great.

I guess two options:

1. Where watermark is to prevent theft

2. Where watermark is to "sign" your stuff

I would expect one can give path to existing file to where to apply watermark and string with "watermark" or path to image to apply.