[ImageJ-bugs] [Bug 947] New: Log of 32-bit Images

[bugzilla at fiji.sc]

http://fiji.sc/bugzilla/show_bug.cgi?id=947

            Bug ID: 947
           Summary: Log of 32-bit Images
           Product: Fiji
           Version: unspecified
          Hardware: PC
                OS: Windows
            Status: NEW
          Severity: minor
          Priority: P5
         Component: ImageJ2
          Assignee: imagej-bugs at imagej.net
          Reporter: matthew.morgan.taylor at gmail.com

Hope it isn't an issue I'm not including a macro, but it does not get much
simpler than this.

For 32-bit images, pixel values for which the log would be undefined (values
less than or equal to 0) return zero instead of NaN. Since this amounts to
taking pixels of undefined value and plopping them immediately in the middle of
the range of output values (as log is defined for the range (0, infinity]) ,
its more than a little troubling. 

If this could be addressed, I'd be quite pleased. I also would be quite happy
if log caused a zero pixel to take on the value negative infinity - even if it
isn't explicitly correct outside of a limit, it is a very useful approximation.

Thanks

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