DPP Home Technique (R)evolution Reduce Noise With Adobe Camera Raw And Lightroom

Tuesday, February 9, 2010

Reduce Noise With Adobe Camera Raw And Lightroom

Adobe Camera Raw and Lightroom both offer easy-to-use controls that will reduce noise without compromising image sharpness, saturation or hue variety


This Article Features Photo Zoom


Final Image

The Camera Raw and Lightroom Detail panel offers sliders for Noise Reduction and Sharpening.
Reducing noise in Adobe Camera Raw and Lightroom (the controls and results are identical) is easy. There are only two sliders for two different kinds of noise—Luminance and Color. Zoom into an image at 100% magnification and move the sliders until noise is reduced, but image quality isn’t compromised. Use restraint. In a majority of situations, it’s better to preserve a little noise than to blur the image substantially.

No noise reduction or
sharpening; appropriate input sharpening.

All noise reduction blurs images. Sharpening after noise reduction during RAW conversion is recommended. Knowing that you’ll sharpen an image after noise reduction, you may reduce noise more aggressively initially.

No noise reduction; appropriate input sharpening
There are limits to how far you’ll want to go. Noise can be so aggressively reduced that surfaces within images become textureless and begin to seem synthetically rendered with software rather than optically captured photographically. This effect may become more pronounced if contours are strongly exaggerated during sharpening. While sharpening, take care not to accentuate noise further. Develop a sensitivity for texture and contour, and use your best judgment. You know what things look like. Make your images look convincing to you, and you’ll quickly convince others.


Appropriate noise reduction and sharpening
RAW converter tools have limits. RAW converter tools do a good job with moderate amounts of color noise. Even high settings don’t tend to compromise image quality; sharpness, saturation and hue variety are all preserved. But sometimes they don’t go far enough. For aggressive noise reduction, especially for larger noise produced by Bayer pattern demosaicing, turn to Photoshop and possibly third-party noise-reduction software.


Excessive color noise reduction; colored halos begin to appear
RAW converter tools do a reasonable job with luminance noise, but aggressive applications may compromise sharpness (some, but not all of this can be compensated for with RAW converter sharpening tools), and at times they don’t go far enough. When you encounter situations like this, turn to Photoshop and third-party noise-reduction software.


Excessive luminance noise reduction; focus significantly compromised
Most images can benefit from a little noise reduction and sharpening during RAW conversion. For many situations, this is all the noise reduction you’ll need. A majority of exposures don’t require substantial post-processing. However, some exposures require more power and finesse than these tools can deliver. When you encounter these, move to more sophisticated tools found in Photoshop and third-party plug-ins. But always start here.

John Paul Caponigro, author of
Adobe Photoshop Master Class and the DVD series R/Evolution, is an internationally renowned fine artist, an authority on digital printing, and a respected lecturer and workshop leader. Get over 100 downloads and his enews Insights free at www.johnpaulcaponigro.com.

 

Check out our other sites:
Digital Photo Outdoor Photographer HDVideoPro Golf Tips Plane & Pilot