For those who will read this, I discovered thanks to Carole what was the mistake I did. Instead of clicking directly on the script button, I opened first a new image, then clicked on the cass-Alpha-Maker, went on till the end and wondererd why I didn’t have all the characters I gave in at the beginning. I was so used to open first an image using the other scripts that I misunderstood it although I read the tutorial.
Alpha-Maker is really one of those wonderful scripts you like to go on playing with endlessly 🙂
