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DPChallenge Forums >> Tips, Tricks, and Q&A >> Please help.
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06/08/2009 08:59:45 PM · #1
Took a shot last night with a Olympus E-500. 60sec F5.0 at 16mm. ISO 200. The photo looked ok on the camera, but as you can see when on the big screen it has red, blue and white specks all over it. Can someone please tell me what would cause this. the link is to a cropped section at full size.
Thanks

' . substr('//img200.imageshack.us/img200/1195/p6080070crop.th.jpg', strrpos('//img200.imageshack.us/img200/1195/p6080070crop.th.jpg', '/') + 1) . '

06/08/2009 09:38:37 PM · #2
the guy in the passenger seat just popped one of those party confetti things.
06/08/2009 09:40:43 PM · #3
wow, I am no expert but they do look square, so could be damaged piks
06/08/2009 09:47:25 PM · #4
OMG ... I have never seen the likes ...
06/08/2009 10:21:54 PM · #5
Originally posted by JulietNN:

wow, I am no expert but they do look square, so could be damaged piks


That was my first thought... that is a boat load of em though...from the colors looks like both stuck and hot pixels.
06/08/2009 10:40:41 PM · #6
do u see it in your RAW copy?
06/08/2009 10:45:41 PM · #7
The long exposure is the key... it's hot pixels. This is not uncommon. The camera probably has "long exposure noise reduction" or something similar. Try turning this feature on and see what kind of improvement you get. CAUTION... us9ing this feature, if available, will probably result in a 60s shot taking 120s, because the camera takes another exposure with the shutter closed.
06/08/2009 10:46:24 PM · #8
These squares look like they're all different sizes. Hot pixels are usually distinct spots, i.e. individual pixels. I've never seen a noise pattern like that before.

Oh... you said 60s shutter time? Hmmmm.... at that shutter speed it could be sensor noise.
06/08/2009 10:53:47 PM · #9
The guy in the car stayed that still for a full minute? I'm either very impressed or very scared. Not sure which.

I think Kirbic is spot-on, regarding the spots.
06/08/2009 11:29:55 PM · #10
I think you will find the answer to your question here. Good luck.

//www.wrotniak.net/photo/43/e500-noise.html

Specifically, read the section titled "Fixed noise and hot pixels".

Message edited by author 2009-06-08 23:30:39.
06/08/2009 11:38:49 PM · #11
Thanks heaps everyone. At least i know where to start now.

Thanks
06/08/2009 11:39:51 PM · #12
Originally posted by JH:

These squares look like they're all different sizes. Hot pixels are usually distinct spots, i.e. individual pixels. I've never seen a noise pattern like that before.


yeah, some of those "hot pixels" actually have nice little borders around them
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