Thank you, Patrick, that helps a lot. What I was wondering is whether each color exposure was equal, but I didn't express that well. I have a few bad pixels as well. When you got rid of yours, was that programmed in before you took the views, or processed afterward? Best wishes and congrats again, Joe PS: Gotta brag. Our son, Sky, successfully defended his Ph.D. thesis yesterday at the University of Arizona. He needs to make a few revisions to his thesis and hand it in, then will officially receive his Ph.D. in August. We're so proud of him -- and you should be too because of your work at the dear old Hansen Planetarium. Sky worked there in the summer and it was very inspirational for him. Also, just FYI and way OT, I should be on Ch. 7's Utah NOW, Friday evening at 8:30 p.m., discussing why the supposed daguerreotype of Joseph Smith isn't him. Patrick Wiggins <paw@wirelessbeehive.com> wrote: Hi Joe, On 06 May 2008, at 13:00, Joe Bauman wrote:
BRAVO, Patrick! Was that from Standbury Park?
Yes.
I wanted to do some phtography last night but the blasted weather prediction called for fairly cloudy skies and I didn't. Obviously I should have.
Don't feel bad. I was sure I was going to get clouded out so I didn't have any plans for data or pretty pictures last night. But then I walked out to tend to the bird feeders around dark and was surprised to see the sky was clear. On 06 May 2008, at 15:35, Joe Bauman wrote:
Thanks, Chuck, I missed that the first time I clicked on the link. I'd still like to see the breakdown of lrgb or rgb. Or perhaps all are equal? Best wishes, Joe
Not certain what you mean. See if this helps: I took 20 one minute unfiltered frames and followed that with 15 two minute exposures through the blue filter, 5 more two minutes through red and a final 5 two minutes through the visual filter (I don't have a green filter but Jerry Foote assured me the visual filter would work). Subtracted master 1' and 2' darks from their respective frames. (Next time I plan to go with all 2' exposures so I only have to deal with a single master dark.) Applied master clear, red, blue and visual flats to each of the corresponding clear, red, blue and visual frames. Removed three bad columns that have developed in the camera's chip from all 45 images and removed most of the hot and cold pixels. Unfortunately I could not remove them all. Same for the occasional cosmic ray hit. Registered all 45 images so they all aligned properly. Added all frames of each color into a master frame (ie all of the reds into a single master Red, all of the blues into a single master BLUE and so on.) Then put the master clear, red, blue and visual frames together to come up with the final image. All of the above was done with CCDSoft except for removing the bad columns and the hot and cold pixels. Those removals could have been done with CCDSoft too but I would have had to treat each frame separately. Fortunately I found a couple of freeware programs on the Software Bisque list serve that take care of such chores automatically. There were a number of "gottchas" along the way that I can't explain but I think I'm slowly coming up with a "standard" recipe for how to do this stuff. Does that help? Cheers, patrick _______________________________________________ Utah-Astronomy mailing list Utah-Astronomy@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Visit the Photo Gallery: http://gallery.utahastronomy.com Visit the Wiki: http://www.utahastronomy.com --------------------------------- Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try it now.