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Old 06-05-2020, 10:01 AM
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Andy01 (Andy)
My God it's full of stars

Andy01 is offline
 
Join Date: Mar 2012
Location: Melbourne
Posts: 3,279
Quote:
Originally Posted by codemonkey View Post

Andy might be impressed, or at least not disappointed in me because I actually bothered to get RGB stars this time.
Yep, great image - well done!
Just my 2c worth but pink stars are darn ugly and white ones are boring!

Quote:
Originally Posted by codemonkey View Post


From here I applied my one "trick" which I thought of recently.
Sounds more involved than it is, but...

* I extracted the starless H from the star-filled H; this leaves me with an image containing just the H stars
* I stretched the RGB colour image containing the stars to roughly approximate the size of the H stars (very roughly, not really important)
* I separated the RGB stars into channels a and b from the lab colour space
* I separated the fully processed starless NB image into L, a and b channels
* Using the H stars as a mask, I blend the a and b channels from the stars into the a and b channels from the NB image
* I then add the H stars to the L channel from the NB image
* I now recombine the Lab channels and have a NB image with stars the size of the H ones, but the colour of the RGB ones

Hope that makes sense (and helps!)
Very interesting technique Lee - I'll have to try that one out myself!
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