Peel Off White 2013 by Shift Studio

Peel Off White 2013 by Shift Studio
http://filterforge.com/filters/11602.html

2 - Threshold control, this filter does not allow to remove white partially, it takes out everything or nothing, so it would be good if you could have also control over how much white or black (not both at the same time) you can remove or peel off.

3 - Remove only Background - One more complex and maybe difficult to make is that the removing is ONLY applied to the external part of the shape, I mean in the case of the FF lifesaver, that it could remove all the white or black from all the outer part of the lifesaver but not remove any part of the inner part, because maybe the image contains a plain white background, but also there is white inside the main image, so this filter removes everything white, and not only the white background outside of the main image.

Here is a visual example

See that sort of thing, you should deal with it manually.

You can construct mask layers but I don't think it'd be flexible as doing it manually, provided you're bound to have images that don't share similarities. There's no "fill" method in FilterForge aside from processing the whole image. You can potentially achieve filling effects via script. Fill would need to look for open gaps and bridges. It'd actually make a nice addition to FF's library of nodes.

If you have a giant batch of 100 images of similar properties (lets say 100 of them have a perfectly white fill, but some objects have white areas in the center.) I'd weed out the images that have something white in the object you want to mask out, fill those image backgrounds with some alternative pure color (lets say red), make a macro that selects that color at coordinates (0,0) or within a safe zone and export that batch separate. The other batch can be done by creating a macro that selects white at coordinates (0,0) or within a safe zone.

And honestly, Photoshop's base masking tools are mostly excellent for this kind of operation. I'm sure you can construct macros based on the plugins as well. No offense, but I find it funny you own 3 third-party masking plugins. (lol gave me a "oh that's so SpaceRay" moment) Honest!