long exposure- noise reduction = amp glow - page 3 - General Discussion and Assistance - CHDK Forum

long exposure- noise reduction = amp glow

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Offline hydrogen

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  • 20
  • Canon A570 IS 1.01A
Re: long exposure- noise reduction = amp glow
« Reply #20 on: 09 / January / 2008, 13:25:32 »
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I also notice purple fringing on my Canon A570.  I was taking pictures of a storm on night.

Exp.  ~30s
ISO.  200


A small to medium patch of purple.  Interestingly, it is only apparent in the RAW file, not the JPG.

Issue with NR off on A630
« Reply #21 on: 24 / January / 2008, 14:50:46 »
Hi! I've been using the shutter override option to do a 50 seconds exposure. And I noticed something strange in my pictures.
On the upper right corner, there is a blue cast "light" visible. I tried to reproduce the problem, and the problem is still visible. Then, I tried to turn the noise reduction on, and the problem disapeared!
Strange thing... anyone else noticed? And how could it be explained?
I post here two pictures, the first was taken with a cap on the lens and the NR turned off, the second one was taken with the nr turned on. I brightened both pictures in order to see the problem better.

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Offline GrAnd

  • ****
  • 916
  • [A610, S3IS]
    • CHDK
Re: Issue with NR off on A630
« Reply #22 on: 24 / January / 2008, 14:54:48 »
CHDK Developer.

Re: Issue with NR off on A630
« Reply #23 on: 24 / January / 2008, 14:58:42 »
Ooohh!
And so, it's normal?
Thanks for such a fast answer! :)


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Offline GrAnd

  • ****
  • 916
  • [A610, S3IS]
    • CHDK
Re: Issue with NR off on A630
« Reply #24 on: 24 / January / 2008, 15:22:16 »
And so, it's normal?
Seems, yes. At least many cameras with different sensors have the same issue.
CHDK Developer.

Re: Issue with NR off on A630
« Reply #25 on: 24 / January / 2008, 15:23:48 »
Thank you very much!

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Offline brainwash

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  • 95
  • Nikon D40x & A460
Re: Issue with NR off on A630
« Reply #26 on: 25 / January / 2008, 05:42:08 »
Essentially, what you got was the dark frame the camera uses to perform NR :)

 

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