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