Noise Filter
When we reviewed the Olympus E-410, the E-420's predecessor, we found that the Noise Filter was applied surprisingly heavily even at ISO 100 and that it had a significant (negative) impact on overall image sharpness.
Noise filter - An HP Real Life technology that reduces image “noise' (an unwanted bumpy or granular look) with minimal loss of detail.
Reduce Noise Filter
Figure 14: Noisy Image
The Reduce Noise filter offers another option for dealing with noise.
3 The Add Noise Filter
4 The Texture Filter Offers
Customize Noise
Noise can come in many forms. Organized or random patterns. Small-, medium- or large-sized, or a combination of all three. Hard- or soft-edged.
All DSLRs apply some sort of noise filtering and all will yield low noise images at ISO settings up to 800. It's really only at ISO settings above 800 where you may find differences between models.
Images with more noise should have a lower Amount a higher Radius setting (maybe even use Noise Filters).
The tool also has an advanced mode. I don't use this very often, but its useful to know about.
The answer: How much noise you add depends on the size of the photo, but try an Amount between 4 and 10 in Photoshop's Add Noise filter for images 13x19 inches or smaller.
Noise is also often seen from scans made using a scanner that doesn't have a wide enough dynamic range to cope with the shadow and highlight areas in one scan. Some image editing programs have a Noise filter that adds a grain pattern to the image to ...
You shouldn't need to add a layer if you can work in 16 bit mode because there should be no banding or posterization in 16 bit mode and no need for the selective (in layer) application of the noise filter.
 See also: Filter, Noise, Image, Camera, Light
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