robertuk22
Posts: 13
Joined: Mon Jun 13, 2005 10:20 pm

Noise Help

Thu Jan 10, 2008 10:53 pm

hi there

i really need some help with noise reduction for this photo can anybody help?

http://i261.photobucket.com/albums/ii58/robertuk22/DSCF0234.jpg

thanks
Visit my Aviation blog featuring Larnaca Airport at http://robertnoel.blogspot.co.uk/
 
DeltaAVL
Posts: 1525
Joined: Wed Mar 21, 2007 10:15 pm

RE: Noise Help

Thu Jan 10, 2008 11:23 pm

Oh my word, that's a lot of grain...

That particular photo is not salvageable, however, if you posted your camera and settings used we could be of more assistance.
"We break, We bend, With hand in hand, When hope is gone, Just hang on." -Guster
 
oly720man
Posts: 5740
Joined: Fri May 21, 2004 7:13 am

RE: Noise Help

Thu Jan 10, 2008 11:33 pm



Quoting DeltaAVL (Reply 1):
if you posted your camera and settings used

from the exif data, finepix s8000, 200iso

You can get a program like neatimage, but you need to be careful where you use it. Where the photo is already "noisy" eg trees and grass then you can lose all the detail and it goes blurred.

http://www.airliners.net/uf/536884808/phpQkUt5K.jpg

I've neatimaged the back of the plane here and you can see the difference
wheat and dairy can screw up your brain
 
robertuk22
Posts: 13
Joined: Mon Jun 13, 2005 10:20 pm

RE: Noise Help

Fri Jan 11, 2008 12:10 am

yes thanks for your reply

the camera i use is a fuji finepix s8000fd

and the setting i put the camera on is auto

hope that helps

also can you tell me more about neatimage

take care
rob
Visit my Aviation blog featuring Larnaca Airport at http://robertnoel.blogspot.co.uk/
 
oly720man
Posts: 5740
Joined: Fri May 21, 2004 7:13 am

RE: Noise Help

Fri Jan 11, 2008 12:14 am



Quoting Robertuk22 (Reply 3):
tell me more about neatimage

http://www.neatimage.com/

Neat Image is a filter designed to reduce visible noise and grain in photographic images produced by digital cameras and scanners. Neat Image is indispensable in low-light (indoors, night, astro) and high-speed (sport, action) photography. It is a tool for both professional photographers and digital image processing enthusiasts.
wheat and dairy can screw up your brain
 
robertuk22
Posts: 13
Joined: Mon Jun 13, 2005 10:20 pm

RE: Noise Help

Fri Jan 11, 2008 10:50 am

o right kool

ive just downloaded a demo version

can you give me any help regarding my camera

and i was told something abous IS0?

thanks
rob
Visit my Aviation blog featuring Larnaca Airport at http://robertnoel.blogspot.co.uk/
 
oly720man
Posts: 5740
Joined: Fri May 21, 2004 7:13 am

RE: Noise Help

Fri Jan 11, 2008 11:41 am



Quoting Robertuk22 (Reply 5):
and i was told something abous IS0?

ISO, in the good old days, related to the sensitivity of the film and had a number 25, 64, 100, 125, 200, 400, etc.

A low number means low sensitivity, i.e. a longer exposure for a given light level. A high number is the reverse, short exposures at a certain light level.

In films the light during exposure caused a chemical reaction in the film that led to the deposition of silver or other molecules that were the black and white or colour in the negative/slide.

Slower films had much finer grain structure than faster films... imagine that more light hitting the film means that more molecules are likely to react to the light. With short exposures, less light means that fewer molecules are less likely to react equally so a more grainy image is produced. Light is a series of distinct protons and a certain number are needed to give the right light levels in a photo.

In a digital camera, the film is replaced by a CCD or CMOS sensing element that consists of an array of millions of light detectors - that give the pixels in your jpeg file. Again these are sensitive to light and the amount of light hitting them triggers an electronic response that is saved electronically as an analog voltage that's then converted to a digital number to be saved in the file on your card.

In the digital camera, however, there is only one CCD element, and ISO is an artificial change. What the setting does is change the sensitivity of the CCD by allowing it to be triggered by less light, but this still means that with short exposures each pixel is hit with less light, and relatively different light levels give a bigger difference (due to the higher sensitivity) leading to what appears as a grainier image.


In your camera it's pretty clear that 200ISO gives grainy images so you'd be better off at 100ISO. Also check the exposure compensation (read the manual). Some people here find that what the camera thinks the exposure should be and what looks right are different so you may need to underexpose the photo or overexpose it. In addition, different parts of an image have different "best" exposure times - a white plane will need a different exposure time from the darker background (to look right) and you need to get the exposure more right for the aircraft.

Get out there and experiment.... use a static aircraft and try a range of exposures and see what the difference is. Best way to learn.
wheat and dairy can screw up your brain
 
Silver1SWA
Crew
Posts: 4455
Joined: Wed Mar 10, 2004 6:11 pm

RE: Noise Help

Fri Jan 11, 2008 11:55 am

I'm not familiar with that camera, but does it feature digital zoom? Zooming out of the optical range and into the digital range produces highly digitized and noisy results.
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robertuk22
Posts: 13
Joined: Mon Jun 13, 2005 10:20 pm

RE: Noise Help

Fri Jan 11, 2008 4:11 pm

Thank you both for your reply

i was deffo get out and have ago and set my ISO at 100

i use optical zoom my camera comes with an 18x optical zoom and sometimes i need to use full zoom to get close

rob
Visit my Aviation blog featuring Larnaca Airport at http://robertnoel.blogspot.co.uk/

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