Reducing CCD Noise
Images captured by a CCD or CMOS imaging chip will often have some noise present. This noise typically can be seen as RGB "flecks", especially noticable in the in the shadow areas of an image. The red and blue channels are especially susceptible. Higher ISO settings and higher ambient temperatures increase the likelihood of acquiring this noise along with your image.
If you find it necessary to shoot with a higher ISO and you find that you have an unpleasant amount of noise in your image, this tutorial will help you improve the image.
Reducing CCD Noise – GIMP tutorial
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