--- In Rob Danielson <> wrote:
> Hi JM--
> Fun analogy to think about. Are there some astrophotographers who
> insist they are documenting "space" opposed to only identifiable
> objects? "Noise" is a very rich construction when I think of it as an
> overlap between perceptual and technical limitations.
>
> Here's a QuickTime movie experiment I did with your recording and
> noise reduction examples:
> http://tinyurl.com/okwpc6
>
> If you have trouble viewing it, I can make an mp3.
>
> Rob D.
Noise in an astrophoto image translates into grain. The great thing about =
digial imaging in astrophotography is that we use very crude cameras in com=
parison to say, my Canon 5D MkII. I basically capture a raw frame with no =
processing and no "raw import" utility. It has hot pixels all over it. So=
me of my exposure times are measured in hours. But that's off topic.
I hastily processed that audio, and I'm sure there are artifacts in it. Wh=
at I would like to know is what are the typical processing tricks people us=
e to get the noise out of the audio. This is going to become more and more=
essential as I try to get the really quiet things around. In the earlier =
audio of that 18 minute sequence, I can hear mosquito's buzzing around the =
NT1-A's. So I'm going to have to learn a few new tricks.
I'll work on that audio with Logic, which tends to have cleaner tools in my=
opinion. Then I'll see what I can do with it.
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