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The Histogram Equalization Function

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The Histogram Equalization Function recalculates the pixel values to produce a histogram that is more or less level. This function has a tendency to bring out faint details in galaxies and nebulosities.

M13
Unprocessed Histogram Equalized
Image of M13 Image  of   M13  With   Histogram
    Equalization

M51
Unprocessed Histogram Equalized
M51   'Natural' M51   'Natural'