The Logarithm Function

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The Logarithm function takes the logarithm of the pixel value in Buffer A and puts it into Buffer B. The formula used is PixB = 13606*Log(PixA) so that a PixA value of 65535 yields a PixB value of 65535. All smaller values are scaled according to the logarithm. The following table illustrates the effect.

PixA Value       PixB Value


 65535              65535
 06000              51407
 00600              37801
 00060              24194
 00006              10588
 00001              00000

M51
UnprocessedLogarithm Function
Image of M51 Image of M51 With Logarithm function

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