LIPH
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Best Way To Reduce Noise

Thu Feb 23, 2006 12:35 am

Which is (beside a low ISO setting) the best way to reduce noise in a pic ?

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martin21
Posts: 335
Joined: Mon Aug 06, 2001 7:52 am

RE: Best Way To Reduce Noise

Thu Feb 23, 2006 12:39 am

The best beside your ISO is a good exposure  Wink
After that you need to shoot in RAW.

Martin21
At 30.000 feet, the sun always shines !
 
dendrobatid
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RE: Best Way To Reduce Noise

Thu Feb 23, 2006 3:31 am

Getting a good exposure in RAW is the best start.
I am a new convert to Rawshooter which seems brilliant to me and there are two noise reduction filters in that, noise and colour noise, both of which can be very finely tuned while watching the effect in order not to overdo it
Neat Image and Noise Ninja are effective too but it is VERY easy to overdo.
Neat Image has a free demo version and RAWshooter Essentials is available as a free download.
Wish I had found that a long time ago !

Mick Bajcar
 
chrisair
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RE: Best Way To Reduce Noise

Thu Feb 23, 2006 3:44 am

You don't always need to shoot RAW. In fact, it is my experience that all RAW does is provide you with a large file and that's it.

Use Noise Ninja. It's the best program out there, used by many newspapers around the country.

I would be kind of interested though, how you're getting "noise" on a picture? Do you shoot planes often at night or really bad light?
 
RuudOnline
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RE: Best Way To Reduce Noise

Thu Feb 23, 2006 4:08 am

It does not matter if you shoot in RAW or JPG, the noise stays the same.

As others said, a good exposure is the best thing to reduce noise.

I use Neatimage to reduce noise when needed (got a d70) and I think this is a neat programme.

Ruud
 
martin21
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RE: Best Way To Reduce Noise

Thu Feb 23, 2006 4:34 am

Quoting RuudOnline (Reply 4):
It does not matter if you shoot in RAW or JPG, the noise stays the same.

I don't agree, the noise in a JPEG file is clearly visible as red/green noise. When using RAW correctly you can produce a much cleaner image with less colored noise !

First I was was very sceptical about it, but when I discovered what you can do with RAW and RAWshooter Essentials I was convinced !

Martin21
At 30.000 feet, the sun always shines !
 
RuudOnline
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RE: Best Way To Reduce Noise

Thu Feb 23, 2006 7:05 am

Quote:
I don't agree, the noise in a JPEG file is clearly visible as red/green noise. When using RAW correctly you can produce a much cleaner image with less colored noise !

Oh I use RAW too, but I never knew that there was a difference considering the noise.

Ruud
 
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ThierryD
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RE: Best Way To Reduce Noise

Thu Feb 23, 2006 7:34 am

First of all you cannot eliminate noise; all you can do is reduce it to a minimum. The best way to do this is by not getting too much noise on the photo from the start.
Theoretically the trick is quite simple.
Noise on a photograph is the result of the camera sensor heating up; the heat is produced from the instant the camera is switched on and increases with high ISO settings, long exposures and some other minor factors. Also the size of the sensor is of great importance; the small sensors from compact cameras are more easily heating up than the bigger ones from DSLRs.
So what to do to reduce noise; well quite easy; just limit any of the listed factors as much as you can.
In the optimum case you'll have a DSLR, a low ISO setting (100-200) a short exposure and a low outside temperature (I guess shooting in the Antarctic would proof quite useful  Wink ).
Of all these noise intensifying factors, the ISO setting is the biggest one; so always try to use as low an ISO as possible.
Apart from that you'll have to try with different settings to see what works best in the given situation.
If some noise cannot be avoided you can try to reduce it with a post-processing tool of which all known to me were already mentionned in the previous replies; I personally use Neatimage and get quite acceptable results most of the time.

Good luck!

Thierry
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