Jump to content


Horsehead season; idea for controlling Alnitak


Recommended Posts

Alnitak is, of course the bane of our lives in Horsey images so here's an idea that I'm going to try ASAP. The star grossly flares, bloats and tries to dominate the image so we want to keep it down.

The main componenet of Alnitak is an 09 spectral class blue supergiant. The nebulosity around it is Ha dominated, so red. How to get less Alnitak and more nebulosity? Use a red filter.

When I have my shortish red exposures all ready for the final image I intend to try to apply just the area around Alnitak to the luminance frame so it will be red-for-luminance just for the area around the star. (Paste red onto lum and then put a big feathered marquee around the bloated region, select inverse and run 100% erasor over the lot. Flatten image and away.)

I don't have any decent horsey data in LRGB to play with but if anyone thinks it's worth a try you can always give it a go.


Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

  • Recently Browsing   0 members

    • No registered users viewing this page.
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. By using this site, you agree to our Terms of Use.