semi-stacking filters

Hi,

While playing with an effect in FF quite a number of times I ran into the wish to post-process the result with an other filter.

Currently the only options are:
-when FF plugin is run: to apply the effect to the original one in the host image editor and rerun FF a second (or more) time.
-when FF stand-alone is run: saving result as, followed by opening it as a new image

I can imagine quite a number of users would appreciate a feature that allows them to replace the loaded 'original image' by the one shown with effect.
For example: image loaded -> choose and set effect -> click an 'overwrite original' button -> (from here internal 'original image' is one with an effect applied to it; not the real original on disk or in the host application) -> choose an other filter -> choose and set additional effect -> either save/ go back to host or click the 'overwrite original image' and repeat as often as liked.

Some might find it most ideal when the individual filters could truely be stacked on eachother with a redo history recorded and that intermediate filters could be edited/ deleted afterwards. This would require a layer-pallette-like list of used filters and also significantly affect rendering time, though.

Others might find it more convenient to have the above described 'overwrite original' button with also a redo history recorded, although the recorded history items are just full bitmap images; nothing more. Then undoing is a one way back thing: first stored last deleted. All could be undone or only i.e. the last three.

Last, most simple option is having the 'overwrite original' without any redo functionality. But even without undo, the 'overwrite original' button can be a very convenient option for many people.

Roberto