Astrophotography Time Lapce using CHDK - blog post - page 2 - Creative Uses of CHDK - CHDK Forum  

Astrophotography Time Lapce using CHDK - blog post

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Offline zeno

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Re: Astrophotography Time Lapce using CHDK - blog post
« Reply #10 on: 18 / August / 2009, 07:24:44 »
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Chop the "p//" out of the html link and it works (at least it does for me)
A570, S100, Ixus 127
Author of ASSIST, STICK, WASP, ACID, SDMInst, LICKS, WICKS, MacBoot, UBDB, CFGEdit

Re: Astrophotography Time Lapce using CHDK - blog post
« Reply #11 on: 22 / August / 2009, 06:18:24 »
The link in the first posting is broken. It should be http://guysoft.wordpress.com/about/videos-of-sky/
Ok, that will explain other posts, fixed.

I'd guess you had dark frame subtraction off.
Yes, I am not sure how to do a darkframe. Do you know what settings I should put on the camera to make one? I could add it to the script for next time.
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Offline reyalp

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Re: Astrophotography Time Lapce using CHDK - blog post
« Reply #12 on: 22 / August / 2009, 18:12:02 »
Yes, I am not sure how to do a darkframe. Do you know what settings I should put on the camera to make one? I could add it to the script for next time.

You can set canon darkframe subtraction auto, off or on using set_nr (0,1,2 respectively). Note that this will take a darkframe after each exposure, doubling the time required to capture each image, and halving your actual coverage of the sky.

You could also take a darkframe manually (by covering the lens) and subtract it in post processing. You'll probably want to work in raw or DNG if you do this.
Don't forget what the H stands for.

Re: Astrophotography Time Lapce using CHDK - blog post
« Reply #13 on: 01 / September / 2009, 07:30:06 »
You could also take a darkframe manually (by covering the lens) and subtract it in post processing. You'll probably want to work in raw or DNG if you do this.
Isn't it possible to make a script that will create a darkframe (without using your hands)?

Also, do you have a way to automatically batch process raw .CRW files? I did not find any tool for this.
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Offline reyalp

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Re: Astrophotography Time Lapce using CHDK - blog post
« Reply #14 on: 01 / September / 2009, 19:07:47 »
You could also take a darkframe manually (by covering the lens) and subtract it in post processing. You'll probably want to work in raw or DNG if you do this.
Isn't it possible to make a script that will create a darkframe (without using your hands)?
Not yet.

Quote
Also, do you have a way to automatically batch process raw .CRW files? I did not find any tool for this.
There are some command line tools that understand CHDK CRW.  dcraw for example. You could easily make a shell script/batch file to do bulk processing.
Don't forget what the H stands for.

 

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