Masking

[metasim]

I'm using rust-ndarray to do some image processing. I need to mask certain pixels in an image based on a classification mask (is it water, is it vegetation, etc.). Python's NumPy has the notion of an associated mask, and some imaging libraries have the notion of a "NoData" value. The mask is then used to mark a pixel as "ignore" in subsequent processing.

Is there an "idiomatic rust-ndarray way" to do this?

The pixel values are u8 or u16 so NaN isn't a usable proxy for this capability.