Thanks Kurt! Tyler -----Original Message----- From: utah-astronomy-bounces@mailman.xmission.com [mailto:utah-astronomy-bounces@mailman.xmission.com] On Behalf Of Canopus56 Sent: Friday, January 22, 2010 4:46 PM To: Utah Astronomy List Serv Subject: Re: [Utah-astronomy] Wow!!! (SLAS Maui imaging session) P.S. to Tyler -
Tyler Allred 2010-01-21 21:27 -700 I am curious about the cleaning process you are using. . . . How are you doing the cleaning... a filter??
There were two parts to the cleaning process. First, a threshold band filter was used to just pull the nebulousity information out of a raw image. In Ha and OIII filter images, this tended to automatically remove most of the smaller and fainter stars in the image, since most stars did not have a strong signal in those bandpasses. Conversely, in the red and blue band, there are many more stars and the stars are exposed to a greater diameter. In those bands, even the fainter stars had a stronger signal. The second part of the cleaning process was using the Heal, Clone and Smudge tools to manually remove stars that were visually intrusive because they had an odd shape (oval or "L" shaped). - Kurt _______________________________________________ Utah-Astronomy mailing list Utah-Astronomy@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Visit the Photo Gallery: http://www.slas.us/gallery2/main.php Visit the Wiki: http://www.utahastronomy.com