New public domain software: astro-dark-frame-library-manager
New public domain software: astro-dark-frame-library-manager
Hi everyone,
I just released software to GitHub to help manage Dark frames and Light frames by temperature. It all began with this forum post last week:
viewtopic.php?f=16&t=1090
I hope you find it useful. I wrote extensively about the How's and Why's in the documentation but I still need to fill in the information about the Arduino temperature logger that I use.
You can find the GitHub repository here.
Brian
I just released software to GitHub to help manage Dark frames and Light frames by temperature. It all began with this forum post last week:
viewtopic.php?f=16&t=1090
I hope you find it useful. I wrote extensively about the How's and Why's in the documentation but I still need to fill in the information about the Arduino temperature logger that I use.
You can find the GitHub repository here.
Brian
Re: New public domain software: astro-dark-frame-library-manager
Nice work Brian, could be very useful for owners of uncooled cameras.
Cheers
Minos
Cheers
Minos
Re: New public domain software: astro-dark-frame-library-manager
Thanks, Minos! It's funny how 144 lines of code can lead to 192 lines of documentation.
Brian
Brian
Re: New public domain software: astro-dark-frame-library-manager
Nice piece of work Brian and my compliments on the documentation.
Dave
Dave
Re: New public domain software: astro-dark-frame-library-manager
Thanks, Dave! Actually it's not hard when it is something you love.
Brian
Brian
Re: New public domain software: astro-dark-frame-library-manager
Last night I collected darks from 9pm to 6am.
I am preparing a darks library for SHO. I took an educated guess based on previous experience with Hydrogen Alpha that an exposure of 50 seconds, unity gain of 389, and offset of 30 is ideal. Well, maybe not "ideal" but I will get a stackable print without saturating stars.
Here is the breakdown by temperature:
It sure will be nice to just concentrate on lights from now on.
Brian
PS: I discovered a typo in the docs, and a bug in the software. All fixed now.
I am preparing a darks library for SHO. I took an educated guess based on previous experience with Hydrogen Alpha that an exposure of 50 seconds, unity gain of 389, and offset of 30 is ideal. Well, maybe not "ideal" but I will get a stackable print without saturating stars.
Here is the breakdown by temperature:
- 60.0F: 19 frames
60.5F: 53 frames
61.0F: 10 frames
61.5F: 94 frames
62.0F: 47 frames
62.5F: 159 frames
63.0F: 75 frames
63.5F: 28 frames
64.0F: 51 frames
64.5F: 39 frames
65.0F: 9 frames
65.5F: 28 frames
- At 65.5F: Mean: 676, Standard Deviation: 152
At 60.0F: Mean: 628, Standard Deviation: 125
It sure will be nice to just concentrate on lights from now on.
Brian
PS: I discovered a typo in the docs, and a bug in the software. All fixed now.
Re: New public domain software: astro-dark-frame-library-manager
Captured another 10 hours of darks last night.
Here is the updated breakdown by temperature:
Brian
Here is the updated breakdown by temperature:
- 60.0F: 28 frames
60.5F: 64 frames
61.0F: 61 frames
61.5F: 231 frames
62.0F: 108 frames
62.5F: 202 frames
63.0F: 125 frames
63.5F: 76 frames
64.0F: 92 frames
64.5F: 79 frames
65.0F: 27 frames
65.5F: 44 frames
66.0F: 62 frames
66.5F: 21 frames
67.0F: 28 frames
67.5F: 23 frames
68.0F: 29 frames
68.5F: 20 frames
69.0F: 14 frames
Brian
- Attachments
-
- Temp vs Time.jpg (54.08 KiB) Viewed 4734 times
Re: New public domain software: astro-dark-frame-library-manager
Very interesting Brian - a 7deg C drop.
A demonstration of what happens when 9am darks are applied to 9pm lights and vice versa would be very educational. An extreme test but should be a good demonstration about why to avoid temperature mismatches.
Dave
A demonstration of what happens when 9am darks are applied to 9pm lights and vice versa would be very educational. An extreme test but should be a good demonstration about why to avoid temperature mismatches.
Dave
Re: New public domain software: astro-dark-frame-library-manager
This is indeed really very interesting. I just wanted to share a different thought to add here, not in anyway trying to take away from your approach though.
I can't help but thinking that when I faced this issue with mismatched temperatures in dark subtraction with my DSLR, I always adopted the LENR function to automatically take a single dark to be subtracted from the preceding light, this of course at the expense of half my skytime, but it worked surpisingly well (there are of course arguments for master dark subtraction beeing better than single dark frame subtraction).
When I use to do this, it was an effort to avoid the problem you illustrate above as much as possible. I think this could be another way to be able to apply such an approach to uncooled CMOS cameras, for the camera to either have a mechanical shutter, which it obviousky doesn't and probably never will, or connected to a filter wheel with a dark frame filter. Of course, you'd need still need a script or some function that doesn't exist yet, which would mimick the function carried out by DSLR LENR - take a light then immediately after a dark frame, then subtract it from the light and render a single dark subtracted single light frame to work with.
Just a thought
Minos
I can't help but thinking that when I faced this issue with mismatched temperatures in dark subtraction with my DSLR, I always adopted the LENR function to automatically take a single dark to be subtracted from the preceding light, this of course at the expense of half my skytime, but it worked surpisingly well (there are of course arguments for master dark subtraction beeing better than single dark frame subtraction).
When I use to do this, it was an effort to avoid the problem you illustrate above as much as possible. I think this could be another way to be able to apply such an approach to uncooled CMOS cameras, for the camera to either have a mechanical shutter, which it obviousky doesn't and probably never will, or connected to a filter wheel with a dark frame filter. Of course, you'd need still need a script or some function that doesn't exist yet, which would mimick the function carried out by DSLR LENR - take a light then immediately after a dark frame, then subtract it from the light and render a single dark subtracted single light frame to work with.
Just a thought
Minos
Re: New public domain software: astro-dark-frame-library-manager
Dave,
That is a good idea. I should purposely stack NGC 7635 with mismatched temperature lights and darks to show how the image quality deteriorates!
Thanks,
Brian
That is a good idea. I should purposely stack NGC 7635 with mismatched temperature lights and darks to show how the image quality deteriorates!
Thanks,
Brian