Now that is very nice. Just about to start processing that data myself. I hope to get as good result!

Nicely done Florent and like Richard I've recently started on this one as well. You've done a great job on the core as from what I'm seeing from the stacked data it's going to require a fair amount of controlling. Steve did mention that there's more ha data to come, so you may just want to wait for that before making a print. It's going to look great I'm sure. With that additional ha data there should be enough to make a noticeable difference. I'm going to try combining the red and ha data in pixinsight to see what it looks like with what data we already have. Thanks for sharing. Ray

can you explain me how to you combine ha and rgb data ? i think that retaining the max value of Ha or R of a pixel will do the trick but i dont have good result

Have a look at Mike's recent post where he gives a detailed description.

thanks , i missed this post