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Noise!

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Old 10-21-2003, 07:54 AM
flight1 flight1 is offline
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Noise!

What causes this great amount of noise (or is it grain) in this photo taken of the Grand Canyon at dawn? I used 200 neg. film and scanned with an HP PhotoSmart s20 scanner. Other photos when the lite improved are fine. Thanks for your help. Tom
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Old 10-21-2003, 10:07 PM
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Doug Nelson Doug Nelson is offline
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I can't explain why this one turned out noisy and the others didn't but I do know that the noisiest channel is the blue channel, and this has a lot of light blue in it.
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Old 10-21-2003, 10:32 PM
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roger_ele roger_ele is offline
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If this neg was just a little more transparent, having a little less exposure than the others that might explain it. Underexposure can cause more grain with film. Have a print made from the negative and see if it looks the same ...
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Old 10-24-2003, 08:08 PM
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boingo82 boingo82 is offline
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Quote:
Originally posted by Doug Nelson
I can't explain why this one turned out noisy and the others didn't but I do know that the noisiest channel is the blue channel, and this has a lot of light blue in it.
jpeg compression recognises that the blue channel is given least importance by human eyes, and that's where it compresses most of the data. Same with the compressors in most digital cameras.
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