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Old Mar 28, 2004, 8:15 PM   #1
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Default Digital camera "noise"

Moving from 35mm SLR cameras to digital photography clearly requires an awesome amount of private research to answer many of the obvious questions that arise. I am workin' on it but there is one persistent question that hasn't been clearly settled for me. That question relates to "noise." I understand the concept of noise from an electronics point of view. What is not clear to me is how noise as it relates to digital photography is personified. In other words, noise does what to the integrity of the image?

Thanks for your help.

Bob
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Old Mar 28, 2004, 8:36 PM   #2
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Noise is to digital as grain is to film. In the film world, if not enough light hits the film in areas or if you use a high iso film, then you will see noticeable amounts of grain in your picture. This is very similar in digital. Usually the higher the iso setting or not enough light, the more visible the digital noise (little speckles of multicolor) you will see. In most digicams you don't want to get above iso 200 ( 400 if you're very lucky )unless you have to and then you use photo editing software, such as Neat, to reduce the noise. Same for DSLR's, but because they have larger CCD's, you can usually use higher iso's before the noise is not tolerable.
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Old Mar 29, 2004, 3:37 PM   #3
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Here's a quick example...

1st Image - DRebel ISO 1600 - Notice the noise?



2nd Image - Same as above ISO 1600 but ran through a noise reduction program called NeatImage



This samples are enlarged... I get very acceptable results for the Web and 4X6 prints...
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Old Mar 29, 2004, 4:35 PM   #4
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Very impresive on the pics using that software.
How do they look if printed 8x10 or larger ?
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Old Mar 29, 2004, 4:44 PM   #5
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I've printed a couple at 8X10s... I would call them acceptable... Put them in a frame, stuck them on the wall.. looks fine from a normal viewing distance... don't put your nose up to the glass...
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Old Mar 29, 2004, 6:08 PM   #6
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my mom had me take some portraits of my family to put up as 8 by 10s in long skinny frames.....i think they look great...this is with my great Canon G2 (4 MP)
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Old Mar 29, 2004, 6:29 PM   #7
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Quote:
Originally Posted by photosbyvito
my mom had me take some portraits of my family to put up as 8 by 10s in long skinny frames.....i think they look great...this is with my great Canon G2 (4 MP)

yeah, but they probably weren't taken at ISO 1600.. (just giving you a rough time... )
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Old Mar 29, 2004, 7:20 PM   #8
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lol i actually wasn't really thinking of noise......lol
i think it was taken at iso 50...actually lol

i was thinking of the printing at larger sizes aspect of digicams.....
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Old Mar 30, 2004, 8:50 AM   #10
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I use neat image as it's good for fine tuning but it takes some getting used to.
I also use another free program for quickies which is faster and a piece of cake to use.
Try this.

http://helicon.com.ua/noisefilter/He...oiseFilter.msi
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