create white box (multiple lines) which adapts to the text width?

I want to place text information on top of a photograph.
For better visibility of the text I'd like to create a white rectangle with
the black text above.
Linebreaks in the text shall be possible and the rectangle should
automatically adapt to the size of the text.

How can I achieve that?

If I use a minipage element in IPE, I have to define its width manually.
In a normal "label" I can not use a \newline command.
and how could I create the white rectangle in the box?

I think this is easy with LaTeX but I do not see how to do it at the moment.

Kind regards

Martin 
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