@MarianneR: thanks, but I don't have MaterialMods appearing there in my Scripts menu. Wow, you have a lot more scripts than came with my PP2010. I'm guessing you've added a number of 3rd party scripts.

Do you know what the script is named as a file in the finder? Is it changegamma.py or something else?

@estherau: is that free script still available and can I get it somewhere?