I’m sorry Stephane,

I still do not manage to do it. In my hand the combine channel only allows to generate a picture with only two channels. Here is an exemple where I have a picture with 3 channels and I would like to duplicate the channel 0 and add it on a new picture as a forth channel. Here in my hand, it duplicate channel zero but erase channel 1 and 2. So at the end I have only a 2 channel images instead of 4.

there is no dialogue in the combine channel to stipulate that we still want to keep all the channel of image 1. I tried to put -1 to specify all channels, but it does not work.

Would you have an idea ?

Thanks