thanks for That!!!! BooksbyDavid :)

really glad I asked!

yes, digital art is about being spoilt for choice, hmmm, 

The Portrait of  the Artist as a Filter is what James Joyce should have written  

Not a digital filter, but as the person who decides what to keep and what not to, regardless of the medium.

Do you ever use  object index pass render in perfect effects to generate a mask (ie help select parts of image) ....  ?