It is used in the scientific sense of the word. See definitions 6 and 7 here:.
Http://encarta.msn.com/.../dictionary/DictionaryResults.aspx?refid=1861633464Chris R..
Even in statistics, certain data is considered to be noise..
Peter.
Persuasive Marketing Systems -inc Copywriting, Design & Photography..
Tee Gee wrote:.
I'm just curious as to why photographers use the word 'Noise' asopposed to say 'blurred' 'pixleated' 'out of focus' etc ? .
To me noise is audible not visual ??.
When I first heard the term I thought of things like noisy zoomlenses buzzing in and out, shutters clicking or pop up flashesclattering i.e. annoying sound as opposed to annoying picturequality..
I look forward to your replies..
I'll assume you don't correctly understand what "noise" is, since you seem ok with interchanging "noise" with "pixellated" "out of focus" and "blurred" (bokeh). Here are some examples:.
High ISO Noise (lots) vs less noise:.
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Sensor Noise, caused by long exposures without noise reduction (dark frame subtraction).
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Pixellated image (cause by upsizing a smaller image):.
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Image with blurred background, called "bokeh" (subject in focus).
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Out of focus image completely:.
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So "noise" is relative and subjective. However it is entirely different than "pixellated," "bokeh," "out of focus" or "blurred".
Tim'Be the change you wish to see in the world.' -Mahatma Gandhihttp://www.flickr.com/photos/timskis6/..
Timskis6 wrote:.
Image with blurred background, called "bokeh" (subject in focus).
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Hmm.
Bokeh is the the quality of the OOF area, not the area itself. You can have good bokeh and bad bokeh, but not deep bokeh nor shallow bokeh..
Brian A...
Tee Gee wrote:.
I'm just curious as to why photographers use the word 'Noise' asopposed to say 'blurred' 'pixleated' 'out of focus' etc ? .
To me noise is audible not visual ??.
When I first heard the term I thought of things like noisy zoomlenses buzzing in and out, shutters clicking or pop up flashesclattering i.e. annoying sound as opposed to annoying picturequality..
I look forward to your replies..
Cripes, can't anyone here give Tee Gee a simple answer to a simple question?.
Tee Gee: The term "noise", like many tech terms, has been borrowed from an original definition. Generally, noise in a digital image consists of noticeable, unsightly pixels that didn't exist in the original scene being photographed. Every digital image, however perfect it may appear under normal circumstances, will show noise if you raise the exposure levels in a post-processing program. Digital image noise can be loosely compared to film graininess..
For a good technical explanation, check this page here at DPreview: http://www.dpreview.com/learn/?/Glossary/Digital_Imaging/Noise_01.htm.
'If they're not screaming at you to get out of the way, you're not close enough' http://www.ChuckLantz.com..
Cripes, can't anyone here give Tee Gee a simple answer to a simplequestion?.
That's funny - I would have thought "Timski6's" reply was far more simple - even going to the trouble of adding pics!.
Noise is what you see in Timski6's 1st two pics. The most commonly occurring type of noise is what you see in the first one (on the left hand side of it.).
The predominant cause of noise (which is all those grainy dots) is taking your photo with the ISO too high..
Having the ISO set at 100 will produce much less of that grainy noise than having the ISO set at 1600..
Like Timski6 says - the other terms you refer to each describe a totally separate part of a photo - and "noise" is one of those many parts.http://www.instantphotos.co.nz..
Thanks folks,.
As you see I put the question in the 'beginners section 'for obvious reasons I'm a beginner!! (even at my age)and it was just that it seemed quite a peculiar term (at least to me) now I know what it means and have seen it..
So I guess that means I am not quite the beginner I was yesterday, so thanks once again..
But I would appreciate a few more replies to my last query re-what camera to buy before I go shopping tomorrow..
Http://forums.dpreview.com/...forums/read.asp?forum=1002&message=24426606..
An even more simplified definition of noise:.
"Noise" in digital photographs is what they used to call "Grain" in film photographs . If you have ever seen a print from ISO 1600 FILM - then you will notice an obscene amount of grain - very similar to shooting ISO1600 with a D70 for instance..
Tee Gee wrote:.
Thanks folks,.
As you see I put the question in the 'beginners section 'for obviousreasons I'm a beginner!! (even at my age)and it was just that itseemed quite a peculiar term (at least to me) now I know what itmeans and have seen it..
So I guess that means I am not quite the beginner I was yesterday, sothanks once again..
But I would appreciate a few more replies to my last query re-whatcamera to buy before I go shopping tomorrow..
Http://forums.dpreview.com/...forums/read.asp?forum=1002&message=24426606.
'87.6% of all statistics are made up on the spot'.
ShutterBuginhttp://www.exposureproductions.smugmug.com.
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