Combining Narrowband and Luminance with RGB

[swmddo]

I have a question regarding combining an RGB to both a Lum and an Ha image.  All three of them are now XISF.  The RGB is pretty good (I think), and I want to combine the Lum and the Ha images with that. (All three are still linear)  I tried the LRGB Combination, but it won't allow me to pick any of the three for any of the channels.  What am I doing wrong?  What do I have to do first to allow them to merge?

Thanks

Steve

[Niall Saunders]

Hi Steve,

Assuming that the images are aligned, then you first need to split the RGB image into the three individual channels. You can then use LRGBCombine process to 'add in' the L image, along with the three RGB images.

If you want to add-in the Ha image, then there are tutorials that will help you achieve this as well - or, you can try doing things yourself by using PixelMatch to mix the Ha with either the Red image, or with the Lum image, or a combinations of both. You would still need to recombine the LRGB channels as I mentioned above - even though you may now have 'modified' versions of the L and Rd channels.

There is also nothing to stop you applying the same process to any other narrow-band filtered images that you may be able to generate.

Hope this helps.

[swmddo]

Thanks Niall!  I will check out the details and let you know how I do.

Steve