Flattening a rolled up photo

I know there has to be someone besides me who needs to straighten a photo that has been rolled up.
Found this method of straightening somewhere on the Net.

You will need a cardboard tube or something similar that has a diameter of about 3" - 4".
Roll the photo or photos against the way it has rolled, onto the core. Using some string wrapped around the entire thing tie it fair snug and leave it overnight or entire day. The photos will be perfectly flat.

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