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The Gaussian Histogram Equalization Function

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The Gaussian Histogram Equalization Function recalculates the pixel values to produce a histogram that is more or less a Gaussian distribution (See CCD Astronomy, Winter 97, Page 16). It tends to bring out faint details in galaxies and nebulosities AND show details in the brighter parts.

M51
Unprocessed Gaussian Histogram
Image of M51 Image of M51 With Gaussian Histogram Equalization

You may want to adjust the Stretch before applying this function, although the images above were 'natural.'