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Dear Richard,

> having all the data, you can effectively apply filtration during the processing

Well, what filters do is they help expose certain channels higher. Say, the red channel is underexposed by 4 stops without filter. In raw processing it will be multiplied by 16 to get proper white balance, or one can put a 2-stop red filter and the multiplication will be 4x times. In my experience it makes for a visible difference in shadow noise, contrast, and acutance.

Having all the data is the goal indeed. With the filter we have more data in weak channels, that is why the benefit.

PS. Found a link, what they are saying coincides with my experience: