Bad noise reduction methods remove noise but blur the edge as shown in the 4X crop.
Good noise reduction methods remove noise but preserve edge sharpness.
(*) This type of noise is also more visible in the ISO 800 example in the sensitivity topic.
Noise reduction techniques
Digital images can be prone to noise due to the visual effects of electronic errors of the camera's sensor.
Noise reduction on RAW image files
When we reviewed the Alpha 700 one of our biggest - in fact one of our only - complaints was that Sony was applying noise reduction to raw files, ...
Noise Reduction Software
Figure 6: Noisy Image
For those photographers who are willing to spend a little cash, there are noise reduction programs that can be purchased.
Noise Reduction Software
There is a number of image editing software that can be used to reduce noise in a digital image after you have taken them.
Noise reduction software is often employed by digital cameras to reduce the appearance of noise in an image.
Noise Reduction
This is also a good time to consider using some sort of noise reduction on the image. Anti-aliasing color works best at the full resolution of the image. See my anti-aliasing color tutorial for more.
Rotating/Cropping ...
Noise Reduction
A major picture quality difference between a digital compact and a DSLR is that the compact produces photos with more noise, similar to the 'grain' of a high ISO traditional film.
Noise Reduction - Some cameras that offer long shutter speeds (exceeding 1 second) usually have a noise reduction (NR) feature that is either automatic or can be enabled in the menu.
Noise Reduction Techniques Using Adobe Photoshop.
One way to reduce noise in a digital image is to make a black frame during the shoot and then sandwich it with the noisy shot.
Noise reduction - the process by which a camera or imaging software removes noise from digital images.
Noise Reduction
As desired. Multiple conversions can be made with and without NR for further merging/masking.
Noise reduction. A technology used to cut down on the amount of random information in a digital picture, usually caused by long exposures at increased sensitivity ratings.
Noise reduction
In noise reduction mode, the camera takes two shots: the normal shot and one with the same exposure time but with the shutter closed.
Noise Reduction
Digital SLRs with long shutter speed capabilities normally offer a noise reduction feature. Noise reduction (NR) is sometimes an automatic function of the digital camera.
Noise Reduction
A process within a digital camera's image processor in which the artifacts caused by 'pushed' ISO ratings and/or other electrical or heat-related artifacts are suppressed or eliminated in an image ...
Color Noise Reduction is less often needed, but images from some cameras may need it more than others. It shows up as random patterns of rainbow colored sparkles where they aren't supposed to be.
Noise reduction:
When a slow shutter speed is used (1/30 sec. and lower), the image degrades due to the buildup of electronic signal ("noise"). Software in the digital camera automatically compensates to reduce that noise.
Noise Reduction
This camera feature eliminates visual 'noise' from your picture when you are shooting at long shutter speeds (more than 1 second).
Online Photo Scanning Service ...
Noise Reduction: Depending upon the level of noise you find acceptable, this may be an important step. I'd recommend using a more advanced noise-removal tool than Photoshop's, such as NoiseWare or Noise Ninja.
No noise reduction or
sharpening; appropriate input sharpening.
All noise reduction blurs images. Sharpening after noise reduction during RAW conversion is recommended.
Does noise reduction work?
A close, thoughtful look at digital grain
How effective is noise reduction software built into compact digital cameras in improving image quality?
noise, noise reduction
Image noise is the additional signal generated by the electrical activity in the sensor.
Noise is mostly visible on uniform surfaces (like blue skies) and in shadow areas.
Digital Noise Reduction. Cleanup process used when transferring analog video signals into the digital domain.
DNG
Adobe's Digital Negative format ...
High ISO noise reduction (effects JPEGs only)
Many dSLRs have a setting for High ISO noise reduction, which will be turned on only for ISO above a certain number, e.g. ISO 800 or above on the D300.
Long Exposure Noise Reduction
High ISO Noise Reduction
USING CREATIVE STYLES
Basic Styles
Style Boxes
Adjustments
Selecting and Adjusting Creative Styles
Using Mr (Memory Recall) Mode
Using The Custom Button
Using The Custom Menu ...
Use your cameras noise reduction (or dark frame subtraction) feature to get cleaner images.
Different light sources can confuse the automatic white balance of your camera.
o High ISO noise reduction (4 levels)
o Lens peripheral illumination correction (vignetting correction)
* RAW and SRAW1 (10 MP) / SRAW2 (5 MP)
* RAW / JPEG selection made separately
* Permanent display of ISO on both top plate and viewfinder displays ...
In most cases the unlicensed Noise Ninja plugin seems to do a slightly better job than most of the rest of the RAW converter's noise reduction tools. However, if you want the power of the full version of Noise Ninja, you'll have to buy a license.
üUse Long Exposure Noise Reduction if your camera is so equipped. This is a feature usually reserved for DSLR cameras, because DSLR cameras are most commonly the only ones with long exposure times in excess of 15 seconds.
My last tip, which is good for any long exposure, is to use the noise reduction function if your camera has it. But only do this once you know the correct shutter time you will be using.
In fact some cameras offer in-camera noise reduction features. Proprietary software is used exclusively, yielding uneven results. Test your camera's capabilities before committing to this feature.
This being the case, be sure to enable long exposure noise reduction. It appears in the custom menu settings. Realize it will take time to process the photo so rapid fire is not the norm.
In 35 mm, this can be mono or stereo, the latter including several different Dolby noise reduction systems (including Dolby A and Dolby SR). The sound head is located twenty frames after the gate for 35 mm projectors.
Second, seek out your DSLR’s long exposure noise reduction feature. It will almost certainly be buried in a sub-menu or custom function setting. Now you’ve found the feature, you have to decide whether you want to use it.
This is good if you want to verify sharpness or noise reduction effect on the image.
Preview Size (default) - DCE 1.2 has now a preview mode where the process will be rendered on a preview of the image.
Most digital cameras apply more noise reduction at higher ISO speeds; sometimes this smears subtle textures and makes pictures look less sharp than they are. Turn off noise reduction if it affects the sharpness of your pictures.
The Camera RAW 6 plug in for Photoshop CS5 has some expanded controls for noise reduction-not only noise in the luminance (brightness) region, but also in the chrominance (color) region.
What is dark noise subtraction/long exposure noise reduction?
Dark noise subtraction is a method for reducing noise in long exposures. First, the camera takes a photograph without the shutter open for the duration of the real exposure.
The new DIGIC 5 image processor offers even more advanced noise reduction technology, giving up to 75% less noise ( Compared to the previous Canon DIGIC 4 processor) at all ISO levels and producing more natural, ...
Some digital cameras have built-in noise reduction technology. Next time you need to take pictures in low light try a few shots with and without it and compare the results. Also have a look at your photo editing software.
Most digital cameras are equipped with some form of noise reduction that is either automatically triggered with high ISOs or long exposures or, in higher-end cameras, can be turned on and off manually.
In other words all the shooting parameters that the camera auto selected or you dialed in including: white balance settings, sharpness, noise reduction, tone curves, exposure compensation, etc.
A lower ISO is best for noise reduction or grain in the final print, but it can be turned up as needed if the image is underexposed. Sometimes the grain in a night shot adds to its overall appeal.
The answer: Be critical about how any noise reduction affects your photo. Look at fine color tonalities-do they still look rich and real? Look at delicate details such as tree branches-are they still strong?
(To be perfectly honest, this could also be the result of excessive noise reduction on the Minolta, but in this case I am fairly sure it's not.
Nikon D2X/D2Xs - Understanding ISO & Noise Reduction Settings
Modern DSLRs allow for image making in virtually any light condition. What are the best settings?
by Nikonian Darrell Young (DigitalDarrell) ...
There are two good noise reduction software programs called"Noise Ninja" or "Neat Image". If you don't push the ISO higher you may find the problem with camera shake if a tripod is not in hand.
Noise results in a reduction of photo detail and clarity, though it can be reduced with special noise reduction software. Noise is most visible when photos are shot at ISO 200 and above with a consumer digital camera.
Healing & Clone tool
3rd Party Plug-ins and Enhanced Lens Correction
One-Click Image Correction with Perfectly Clear®
Noise Reduction with Noise Ninja™ Technology
Blazing Fast RAW Conversion
Highlight Recovery and Fill Light ...
the Develop module, which is the RAW image editor, on the left side of the application, you have all of the expected editing parameters available, such as white balance, exposure, highlight recovery, shadow detail, sharpness and even noise reduction.
Neat Image 4.4 Pro+ software review
This article describes the features found in Neat Image 4.4 Pro+, currently touted as the best noise reduction programs available for digital photos.
I don't mind a little bit of noise in the picture if it's not distracting, so if I think it's acceptable, I tend to not do any noise reduction. I do sometimes use Noise Ninja, though. I don't do it much.
If you want to edit images directly on your phone, programs like the iPhone's PhotoForge offer tools like automatic noise reduction, white balance and exposure adjustments, and the ability to create filter effects.
There are a variety of in-camera and software based noise reduction solutions available.
 See also: Reduction, Noise, Image, Camera, Light
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