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filmscanners: Noise correction algorithms

This question is for Ed, and any other program-savy people who want to

Since dust is always "white" on negs and always "black" on slides, while
"noise" is usually lighter and "grain" is usually darker than the
surrounding field of pixels, is this or can it be considered in the cleaning

This suddenly seems so obvious as I experience the problems more, and I
wonder what I'm missing that it isn't more easy to deal with. (?) Example:
red pixels in sky colors, when it isn't sunset, green pixels in skin-tones
and shadow tones at mid-day. It's very perplexing, because I'm pretty sure
my scanner or its software is actually "seeing" or at least "interpreting"
those pixels. I could, of course, be wrong, but that's how it looks to me.

Best regards--LRA

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