Neat Image is the best of all for reducing noise in the smooth sky, but it sacrifices some fine detail in the tree branch and vertical mortar/grout lines in the brickwork. Noise reduction with Neat Image Pro Plus 4.5 uses default settings and "auto fine-tune" If you were to take two shots of a smooth gray patch, using the same camera settings and under identical conditions (temperature, lighting, etc.), then you would obtain images similar to those shown on the left. This way, random fluctuations above and below actual image data will gradually even out as one averages more and more images. Image averaging works on the assumption that the noise in your image is truly random. Averaging can also be especially useful for those wishing to mimic the smoothness of ISO 100, but whose camera only goes down to ISO 200 (such as most Nikon digital SLR's). An added bonus is that averaging may also increase the bit depth of your image - beyond what would be possible with a single image. ![]() Averaging has the power to reduce noise without compromising detail, because it actually increases the signal to noise ratio (SNR) of your image. Image averaging is common in high-end astrophotography, but is arguably underutilized for other types of low-light and night photography. This section compares a couple common methods for noise reduction, and also introduces an alternative technique: averaging multiple exposures to reduce noise.
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