GulfstreamGuy
Topic Author
Posts: 625
Joined: Sat Jul 03, 1999 6:30 am

Photo Acceptance - Post-Screening (GulfstreamGuy)

Mon Mar 30, 2009 9:47 am

I have all but given up on trying to submit to A.net! Please someone explain to me what "digital noise" is! I was rejected because of this very thing.

http://www.airliners.net/procphotos/...90327_n1237788874.7496dsc00801.jpg

and..

http://www.airliners.net/procphotos/...90327_f1237788696.7002dsc00799.jpg

Any ideas?

jason
GulfstreamGuy
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oly720man
Posts: 5760
Joined: Fri May 21, 2004 7:13 am

Photo Acceptance - Post-Screening (GulfstreamGuy)

Mon Mar 30, 2009 10:21 am

It's most obvious in the brighter part of the photo on the left edge, 1st photo, and along the top, 2nd photo. Basically the graininess and it's due to how the CCD sensor reacts to low light levels. Because you need a certain amount of light to "trigger" a pixel, you can end up with a random pattern of noise when there is little light.

You __might__ be able to clean it up a bit with something like neatimage.
wheat and dairy can screw up your brain
 
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cpd
Posts: 4639
Joined: Sat Jun 28, 2008 4:46 am

Photo Acceptance - Post-Screening (GulfstreamGuy)

Mon Mar 30, 2009 10:24 am



Quoting GulfstreamGuy (Thread starter):
Any ideas?

And before you try to re-edit it, both are over-sharpened, with very obvious jagged edges.
 
soon7x7
Posts: 2267
Joined: Thu May 04, 2006 10:51 am

Photo Acceptance - Post-Screening (GulfstreamGuy)

Mon Mar 30, 2009 12:33 pm

Next time if your camera has a long exposure noise reduction setting, engage that, as noise seems to occur mostly in the dark fields. It is sometimes , I believe confused with grain...but I'm led to believe that noise is actually gaps in the exposure if you greatly magnify the image...I'm not 100% sure of this but that is what I've been told. I'm sure I'll be corrected on this.
 
JohnJ
Posts: 1366
Joined: Tue Jun 27, 2000 5:01 am

Photo Acceptance - Post-Screening (GulfstreamGuy)

Mon Mar 30, 2009 3:18 pm

Even for night shots, if you're using a tripod use the lowest ISO setting your camera supports. This will require a longer exposure time, but for stationary subjects like yours with the support of a tripod, this shouldn't be a hindrance and the lower ISO will reduce the grain and noise.
 
unattendedbag
Posts: 2156
Joined: Wed Oct 08, 2003 10:35 pm

Photo Acceptance - Post-Screening (GulfstreamGuy)

Mon Mar 30, 2009 4:56 pm



Quoting GulfstreamGuy (Thread starter):
I was rejected because of this very thing.

what were your camera settings?
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