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DPChallenge Forums >> Tips, Tricks, and Q&A >> How to reduce noise?
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Showing posts 1 - 13 of 13, (reverse)
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 06/03/2005 01:11:09 AM · #1
Hey,
Im a new camera owner and I would like to know how to reduce noise in my photos further. I already set my camera to ISO 80, what other ways can I use to reduce noise?
 06/03/2005 01:13:44 AM · #2
Lots of light to keep the exposures fairly short. Long exposures tend to introduce noise.
 06/03/2005 01:16:28 AM · #3
NeatImageand NoiseNinja. Download the free demos.
 06/03/2005 01:23:15 AM · #4
These are good, any other tips?
So far
ISO
Short Exposure
Post Processing Tools
 06/03/2005 01:44:32 AM · #5
turn on your noise reduction, try to shhot in the most light possible, dont zoom with digital zoom, and i cant think of anything else besides the obvious low iso.
 06/03/2005 01:46:44 AM · #6
good example...
high iso
long shutter
low light
digital zoom on to max limit
no noise reduction


Message edited by author 2005-06-03 01:47:18.
 06/03/2005 02:18:48 AM · #7
Okay my camera is set from STD Noise reduction to HIGH noise reduction. The pro seems obvious, but what is the downside to doing this, surely there must be one or my camera would just be permanently on high noise reduction right?
 06/03/2005 02:43:38 AM · #8
Originally posted by Pedxer:
Okay my camera is set from STD Noise reduction to HIGH noise reduction. The pro seems obvious, but what is the downside to doing this, surely there must be one or my camera would just be permanently on high noise reduction right?


Outside dpc grain can actually be a good thing and has the potential to add artistic qualities to an image. When you have a lot of noise reduction you begin to lose detail and poorly applied noise reduction is in effect blurring the image. Also sometimes with things like skin or other textured surfaces noise reduction can leave them looking plastic.

But for the purpose of dpc always have your noise at the lowest possible setting.
06/03/2005 02:55:41 AM · #9
Thanks everyone for their help, as far as knowing when to have my noise reduction high, standard, or low as default how should I decide? Should I keep it set on high reduction as default, or should I only have it on high in some instances? Is it when I expect a shot to be somewhat grainy I set it high, and when I expect minimal grain keep it low? If dont have an eye for such things what setting should I keep it on? So many questions........How was your day?
 06/03/2005 03:45:32 AM · #10
I would keep it on as low as possible, and do things about it later in post-processing. Any decisions you let your camera make for you and hard to undo.

e
 06/03/2005 03:00:37 PM · #11
So you think noise is best cured in PP or during shooting? How does noise reduction work?
 06/03/2005 03:23:00 PM · #12
Most noise reduction techniques involve blurring specific types of artifacts and/or subtracting a noise pattern from the image. There is usually a loss of image detail associated with this process. But you have control of how much loss is acceptable through user adjustable parameters.
One other noise reduction technique not previously mentioned: keep the camera cool (but above the dewpoint) to reduce the thermal noise generated in the camera's sensor and processing amplifiers, ie. don't leave it setting in the sun or unprotected in a hot car. Thermal noise in semiconductors is an exponential function of temperature, so even a few degrees can make a significant difference.
 06/03/2005 03:54:41 PM · #13
That's a good tip...didn't know about that one. Thanks!

Originally posted by ElGordo:
Most noise reduction techniques involve blurring specific types of artifacts and/or subtracting a noise pattern from the image. There is usually a loss of image detail associated with this process. But you have control of how much loss is acceptable through user adjustable parameters.
One other noise reduction technique not previously mentioned: keep the camera cool (but above the dewpoint) to reduce the thermal noise generated in the camera's sensor and processing amplifiers, ie. don't leave it setting in the sun or unprotected in a hot car. Thermal noise in semiconductors is an exponential function of temperature, so even a few degrees can make a significant difference.

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