I ran into this while working on the rcd demosaicer, some high-iso images taken 
with areas almost
completely dark showed strange noise effects.

Analysis showed that the demosaicer expected data to be always >= 0.

Taking a look at the rawprepare iop sources shows that the blackpoint values 
are correctly subtracted
and scaled but are **not** corrected to be at least zero.

Is this behaviour desired?

Hanno

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