Sorry for not answering before, I wasn't aware of your reply. I'm using the TIFF format, it supports more than 5 channels, I know it for sure as I already have some TIFF images with CMYK format plus extra channels (I can see them correctly if I open the image with photoshop). I haven't been able to do the combination with the current alpha version, as I said in previous posts, the extra channels seem to be ignored. Hope I will be able when the new version will be finished.....
Thank you very much.
Anna