Quote:
Originally Posted by markas
Greg, Willik, and Bob,
Thanks for your comments.
Greg, have you used Arcsinh Stretch in your PI processing? I found that it added artifacts to bright star cores in the RGB master frame. I haven't really chased it down, so this rendition is using good old HT stretch only. Any advice 
Mark |
I use CCDStack and Photoshop. I rarely use PI to help with a difficult registration but even then I tried doing that the other day and I couldn't get it to work. Not sure if they have changed it.
Common practice is to remove the stars first before a heavy stretch to avoid blowing out stars. Or do a star mask first so the stretch only applies to everything bar the stars.
Your stars do look a little harsh. Their brightness should be bell curved as the airy disc (the smallest point of light your setup can produce) has lighter rings around the centre.
Greg.