Masks are used to limit where filtering takes place, and how strong the filtering is applied. lvsfunc offers a couple of masks, and they're often used internally in other functions.
All masks come limited by default, so you don't need to worry about illegal ranges messing with your masked output.
lvsfunc.mask.BoundingBox lvsfunc.mask.DeferredMask lvsfunc.mask.detail_mask lvsfunc.mask.detail_mask_neo lvsfunc.mask.range_mask
lvsfunc.mask.BoundingBox
lvsfunc.mask.DeferredMask
lvsfunc.mask