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DPChallenge Forums >> Individual Photograph Discussion >> What is this noise, how do I avoid it?
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Showing posts 1 - 14 of 14, (reverse)
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02/09/2006 05:12:33 PM · #1
//www.salvationarmory.com/upload/images/IMG_2444.JPG
All of the darker areas in my photos seem to get this odd noise that appears in horizontal bars. I have no idea what it is or how to stop getting it to show up. I've tried multiple ISOs, exposure times and aperatures. It's really bumming me out. Any ideas or suggestions would be appreciated.

image links to fullsize where it's very apparent.

Message edited by frisca - changed link to text.
02/09/2006 05:15:24 PM · #2
Even though the image is a link it's still a bit big to post in the forums. Thumbnail size works better.

I'm not seeing what you're referring to, even in the full size version.
02/09/2006 05:16:57 PM · #3
I don't see it either, sorry, even in the fullsize. Are you sure you don't have a monitor problem?
02/09/2006 05:17:29 PM · #4
Where exactly are you seeing banding? I see none in either picture. Are you sure it isn't a monitor issue?
02/09/2006 05:17:59 PM · #5
I see it! But I have no idea what it is :-(

All I can do is confirm that you're not going crazy...
02/09/2006 05:26:07 PM · #6
Originally posted by ladyhawk22:

I see it! But I have no idea what it is :-(

All I can do is confirm that you're not going crazy...


Maybe you're both going crazy ? :D I don't see anything. I think it's hard to judge the noise on this image because of the weird colors. Does the "noise" appear on other pictures with a different subject ?
02/09/2006 05:37:38 PM · #7
I tried on three different monitors at different resolution.

Sorry, don't see it!
02/09/2006 05:49:56 PM · #8
Maybe I am going crazy. Let's try another image

' . substr('//www.salvationarmory.com/upload/images/IMG_1600_thumb.JPG', strrpos('//www.salvationarmory.com/upload/images/IMG_1600_thumb.JPG', '/') + 1) . '

and a crop:
' . substr('//www.salvationarmory.com/upload/images/IMG_1600_crop.JPG', strrpos('//www.salvationarmory.com/upload/images/IMG_1600_crop.JPG', '/') + 1) . '

both images link to original image.
02/09/2006 05:57:42 PM · #9
I don't see it - AAAAHHHHH - I might be going blind. Sorry. I know that I had a problem with my Canon EOS 300 LSR Film Camera - The mirror thingie in both the Canon and Minolta LSR cameras was busy getting some weird living fungy on it causing ugly spots on the photos. Had to send them away to be repaired. Since this, I send my Canon EOS350D and the other two for a service once a year.
02/09/2006 06:28:26 PM · #10
If I pull up an image in abode bridge that is very dark, the RAW converter tries to 'correct' the exposure. This results in an EXTREME case of the horizontal lines you are referring to. They are barely noticible to me in your images but I know what I am looking for; from my experience, it is from SW exposure compensation, or lightening a very dark image. Essentially, typical noise that, in extreme cases, looks like strips.

Best way to get rid of it? Maybe dropping the exposure and trying to work in curves would help.
02/09/2006 07:06:28 PM · #11
There is certainly a very small amount of noise that has a horizontal banding component to it. Given the 400 ISO and the very dark exposure, it does not seem excessive at all. Increasing the exposure somewhat and then pulling it back down in post-processing can help, but of course you lose some of hte shutter speed advantage of the high ISO.
If you shoot in RAW, the converter you use may have som impact on how much banding is visible in the final converted shot, though it does not affect how much is there in the as-shot data.
02/09/2006 07:30:08 PM · #12
If my camera gave out this little noise i would be very happy.
The higer the ISO the more noise will appear, esspesially in dark images.
I have been shooting a lot at 1600 ISO recently and there is a lot of noise, so much so that i am having to incorporate it into the pictures and tell the client that it is intentional.
Seems to be working...
02/09/2006 07:46:02 PM · #13
You could avoid the noise completely by shooting to film ;)
02/09/2006 07:50:56 PM · #14
Originally posted by Megatherian:

You could avoid the noise completely by shooting to film ;)

Heh, I guess I thought the 20D was closer to film than it actually is. =P
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