How to create WriteableBitmap from BitmapImage?

This is a total contrivance, but it does seem to work ...

WriteableBitmapFromBitmapImageExtension.FromBitmapImage() works by using the original Uri used to load BitmapImage and IIRC it only works with BitmapImages from the appx. In your case there isn't even a Uri since loading from Pictures folder can only be done by loading from stream, so your options from the fastest to slowest (I think) are.

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