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Christian Barrette
{K:21125} 5/24/2004
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Noise is a concept relative to false information. In digital photography, noise will refer to randomly distributed dots of false light and colour information. In the process of transforming the original image data into a compressed format (jpg), the phenomenon is amplified by the making of small clusters around the false dots. These small patches are called artifacts, in the sense that they are artificially created and not part of the original scene. They look like flakes.
The initial creation of noise in digital light sensor is worse in areas of low information - that is in areas that are darker. It is not then uncommon to see it in the shadows of a photography. It is also expected in low light conditions. This is visible in the commented image in the darkest clouds and field.
In photography, in order to capture a low level of light, either the lens must be opened further, the time of exposure expanded or the sensor - or film - be set to a higher degree of reaction to light - the later degree being measured on an ISO scale. If the lens has reached its full maximum aperture, and the speed is not to be lowered in order to avoid camera movement blur, then the sensibility of the sensor has to be raised. With a higher ISO setting, things work like if you ordered the sensor to put out information at all cost. Its output though is then charged with noise. "You've asked for output, you got it, but don't blame me if it's full of junk! ", says the sensor...
I hope this answers at least partially your question.
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Titia Geertman
{K:5582} 5/24/2004
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I'm still curious what noise in the picture is.
Titia
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Christian Barrette
{K:21125} 5/24/2004
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Oh OK.
I was only pointing to something that you could eventually control, but if it's not the case, don't pay attention.
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Don Loseke
{K:32503} 5/24/2004
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Fun to just watch the clouds make their patterns. Are you retired now?? Having fun. Don.
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Titia Geertman
{K:5582} 5/23/2004
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Hi Christian,
What do you mean by 'noise' in the sky?
Do you mean the grey flares? They just came with the cloud. I used my old Kodak on this one and I know nothing about ISO or such. I just click and out comes the photo. I'm totally illiterate as it comes to photo techniques.
Titia
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Christian Barrette
{K:21125} 5/23/2004
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Beautiful sky crounching the ground. You have set the horizon low in the composition, which I think is very effective for that special moment you caught.
There is a lot of noise in the picture, maybe have you used a high ISO level, due to the darkness ?
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Ellen Havrilla
{K:8618} 5/23/2004
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Goed gevangen, Titia, dit speciale licht!
Mooie opname.
Groetjes
Ellen
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Roberto Arcari Farinetti
{K:209486} 5/23/2004
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superb colors composition..
nice moment!
roby
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Teunis Haveman
{K:53426} 5/23/2004
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Titia, mooi deze wolken en het licht daar in
Teunis
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