CompuServe Messages

Jim, I looked at the TGRAB5P specs and since you've done some rotoscoping (sounds like a lot!) maybe you can give me some feedback. On my Fast video card you can grab a frame which is essentially both fields (it interpolates them). I note that using a Targa you need to specify which field you want to grab. Now, my question — if I use a Targa and grab this way, am I missing the alternate field for each frame captured? And, if so, how does this affect the video captured? My (limited) understand of frames/fields is that each field contains valuable information and thus this method of capture would not be as good as getting the interpolated info my Fast card can provide. If my understanding is right, for quality rotoscoping you'd have to grab each field, fieldify them somehow, and then process the info (my primary use of this would be adding special effects digitally to live video) and finally render them back onto tape. I'd like anyone involved in rotoscoping to comment, as I have a Targa+ that I've yet to install due to this understanding (because I use my Fast for rendering as well).