Version 5.0 of PTGP (the Photomertry Transfoms Generation Program) is in final testing and will be discussed at the November meeting. The new version makes the generation of transform coefficients very simple - and eliminates the need for spreadsheeets!
PTGP runs on both PC and Mac, but there are a couple of unique annoyance problems when running on a Mac. I need to find someone who has done Mac Python development to discuss the problems. If you can help, please send me an email - gordonmyers@hotmail.com