Rohdruck Meaning?

[TorpedoLos]

All,

I am considering purchasing several studio portraits of KM officers. The portraits appear to feature the word "Rohdruck" in small perforations across the photo. Can someone help me with what that means and what its significance is? I've seen this on other portraits in the past.

Thanks to all!

[pauke]

meaning

The English equivalent would be "proof" stamped on a photo. The German term literally means "raw print".