Alley in Pisa, Italy

by Lars Kotthoff

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6
votes
4answers
287 views

Can information like a signature, secret key or password be encoded in a photo?

I want to protect copyright of my photographs. So, I've decided I'd like to put some signature like information in my photos. According to my research, - I have copyright as default and I don't ...
2
votes
2answers
1k views

How do I add watermark for photos already in Picasa web?

Is it possible to add visible/invisible watermark to photos already uploaded to Picasa Web/500px/Flickr? Do they preserve EXIF(metadata) of the image? I am looking for free tools/services. If ...