When you use higher ISOs in your camera or employ very long shutter speeds, the electrical noise generated by the camera becomes visible. In many respects this is very similar to the grain we saw using high speed films in conventional cameras.
There are two types of electrical noise you may see in your images, mono-chromatic noise, and chromatic noise. Mono-chromatic noise is visible as black and white speckles in your image, whereas chromatic noise are the multiple-color spots.
Basically all noise reduction software and techniques use some sort of blurring to reduce the visibility of the noise. But they generally come with a price. There can be a loss of sharpness. Reducing mono-chromatic noise is more of a challenge that reducing chromatic noise.
The article linked below describes how to use Photoshop or Photoshop Elements to easily reduce any chromatic noise in your image without compromising its sharpness. The article was published on www.digitalphotopro.com and was written by John Paul Caponigro.
The next time you have one of your night shots taken with a long shutter speed or had to push your ISO to the upper boundaries of your camera’s capabilities, try this technique. Remember it’s targeting the chromatic noise in your image.
Leave a comment and let me know how it worked for you.
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