Using NBRGB Combination Script to add Ha to RGB/LRGB image in PixInsight

I have come across a lot of posts in various Astro forums like Cloudynights and Webastro where people seem to run into issues adding Ha data to RGB/LRGB. Let us examine one the methods today : The NBRGB Script. I do sincerely apologize for this lost post and will ensure to upload a video to make things easier.

                                  As the heading suggests, this is one of the easiest methods of combining Ha to RGB. Just bear in mind that even though this is a pretty straight forward approach, it might take a couple of tries to get the right parameters so that the finished product is acceptable. Lets go through the process : 

1) The first step involves using Background Neutralization on your RGB image as shown below.

Just make sure that the preview area chosen is free of stars and nebulae and is pure background.After running Background Neutralization use STF(Screen Transfer function) to see if the changes.No processes have to be performed on the Ha stack for now.

2) Next step to load the NBRGB script( Found in Script >> Utilities >> NBRGB Script) and you will get a window. The values you enter in this window will depend on the Ha data. Assuming that the Ha and RGB are in linear mode.

3) Choose the RGB image as the source image under the Source Image tab and leave the bandwidth at 100.

4) Use the Ha data in the R channel and now depending on you filters bandwidth(nm) enter the appropriate values for instance for Astrodon 3nm enter 3, 5 for 5 nm 7 for Baaders etc. 

5) The scale is probably the most important parameter here as it determines how much Ha data needs to be blended in. I have found that as long as the data are in linear state, a scale of 10 really brings out the Ha regions well. But do bear in mind that adding too much Ha will impact the background of RGB images so this step might involve a bit of trial and error. See the following images for the difference between a scale of 1 and a scale of 10( Make sure that the AutoSTF checkbox is ticked and click on NBRGB button) : 

As you can see the image on the right ( Scale 1 ) is much more natural compared to the one on the right ( Scale 10). When it comes to Galaxies, a scale range of 1 to 4 usually works wonders on HaRGB combinations where as on Nebulae even 10 appears to be the best bet ( Especially with emission nebulas). Hope you found this informative. Let me know if you have any clarifications or concerns.