Maybe I did not express myself correctly Steve (Handrawn). I am not suggesting a pixel selection but instead a vector shape of the same area as old.gezier wants to select and to use a vector shape with a duplicate of the photo to which the filter has been applied, and to intersect just that portion of the filter, which when placed over the photo gives the same result.
In my example here, the entire rose colored portion can be selected and this process applied.
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