I was reading some of my photography books this morning and specifically about filters and filter systems. Cokin is what this author was recommending. What I noticed was that most, not all, but most of these filters can be applied in Photoshop in one way or another. Now obviously things like Polarizing filters actually change the data captured by the film or digital cameras. However the warming filters and even some of the ND filters can be simulated in Photoshop in one way or another. The problem I have is that sometimes I want to apply a certain filtering effect then do other filters or adjustments after that. Then I may want to see what it would look like without the say, warming effect. If this were a layer then I could just deselect the viewing of the layer, but as a filter I would have to delete that effect then reapply it if I wanted to ?turn it back on?. My question is actually three parts. 1) Does anyone know if there are layer type filters out there anywhere? 2) And if not, would anyone else find these types of preset layers useful? 3) Lastly, if you would find them useful, does anyone know where I could find specifications on these filters so I could simulate them as closely as possible in Photoshop? Thanks in advance! Magick Michael aka zhounder