PI comes with a script titled HaRVB which services the purpose. There are other scripts in the forums as noted below;
http://pixinsight.com/forum/index.php?topic=3446.0
http://pixinsight.com/forum/index.ph...35332#msg35332
You must be logged in to obtain the file. Place it in your PixInsight/src/scripts/ directory.
These scripts aren't doing anything magical. When you look under the bonnet, they are still doing pixel math routines to add the Ha data to the Red filtered data. The script simply streamlines the process. The downside to the scripts is you don't have infinite control on the blend i.e. if you only want to blend 80% Ha into the red channel and 10% into the blue channel, you still need to do this manually. Also if you need to change the RGB weights to bring back colour balance this needs to be tweaked manually. There are no free lunches but I wish there were.
