Adding L to RGB with a Mask

Mikko Viljamaa

Hi Adam,

I thought I've seen a video from you where you add L data to RGB using a mask so that only the Galaxy portion was utilized. Either at your Horizons or Fundamentals section, I cannot remember and now I cannot find it anymore. If I haven't been dreaming, can you guide me to the right video.

Thanks,

Mikko

BlockHead

Hmmm... can you describe what exactly you are trying to do?

I know I have done the opposite of what you described... where there was something terrible

in L data and I stole "information" from a combined (monochrome) RGB image in order to substitute real data for the problem stuff. But I can't think of an example where I took L data and put it into an RGB image using a mask. At least not off the top of my head (I have done so much stuff... lol). 

Let me know a little more info.

-the Blockhead

Mikko Viljamaa

Thanks, if you cannot remember a case like that, it means that I've been dreaming... Maybe I'm confusing this to adding Ha data to LRGB where I think you did some masking first. 

I'm raising the question after AstroBin lost my images and when uploading those again, I noticed how bad some of them were. Especially some of the Galaxy BG's were horrible and when reprocessing them I noticed how I get the best BG (and stars!) when I mask the RGB and only add the L on the Galaxy portion. What I don't like in this is that some of the data is compromised and I cannot use a slight convolution first to my RGB data. Convolution used to be my go-to method as then I didn't have to worry about RGB noise.

- Mikko