Star subtraction

[Rocket Pooch]

Hi,

I remeber Fay saying something about this and how to do it, here's a link.

Chris

http://darkhorizons.emissionline.com/stars.htm

[Carole]

That's pretty nifty.  Will be useful.  I knew how to remove the stars but not how to fill up the holes.

Carole

[The Thing]

Deep Sky Stacker will create a star mask image for all the stars it has identified if told to. This can be used in GIMP/Photoshop to mask of the stars, create selections etc. Shame I've never got round to using it...

[mickw]

If for example this technique was used on something like M45 to enhance the nebulosity without bloating the stars, would the new "star layer" need to be applied behind the tweaked nebulosity layer ?

I'm thinking that the other way round would create dark haloes ?

[Rocket Pooch]

Just had a play and if you put the nebula layer in front of the stars as a luminance it works really well.

[Rocket Pooch]

Before

ic59-63-HaGB-Big by chrissuddell, on Flickr

After, bit not processed properly

ic63test by chrissuddell, on Flickr

[mickw]

Thanks for that Chris

[MarkS]

Very interesting Chris. 
It certainly enhances the nebulosity in your image. 
I might experiment with the technique.

Mark