Commits on Jun 26, 2019

1. Added an image.entropy() method …

   This calculates the entropy for the image, based on the histogram.
   
   Because this uses image histogram data directly, the existing C
   function underpinning the `image.histogram()` method was abstracted
   into a static function to parse extrema tuple arguments, and a new
   C function was added to calculate image entropy, making use of the
   new static extrema function.
   
   The extrema-parsing function was written by @homm, based on the
   macro abstraction I wrote, during the discussion of my first
   entropy-method pull request: https://git.io/fhodS
   
   The new `image.entropy()` method is based on `image.histogram()`,
   and will accept the same arguments to calculate the histogram data
   it will use to assess the entropy of the image.
   
   The algorithm and methodology is based on existing Python code:
   
   * https://git.io/fhmIU
   
   ... A test case in the `Tests/` directory, and doctest lines in
   `selftest.py`, have both been added and checked.
   
   Changes proposed in this pull request:
   
   * Added “math.h” include to _imaging.c
   * The addition of an `image.entropy()` method to the `Image`
     Python class,
   * The abstraction of the extrema-parsing logic of of the C
     function `_histogram` into a static function, and
   * The use of that static function in both the `_histogram` and
     `_entropy` C functions.
   * Minor documentation addenda in the docstrings for both the
     `image.entropy()` and `image.histogram()` methods were also
     added.
   * Removed outdated boilerplate from testing code
   * Removed unused “unittest” import

   

   fish2000 authored and radarhere committed Jun 26, 2019
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2. Removed variable

   

   radarhere committed Jun 26, 2019
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   1a71faf View commit details

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3. Lint fixes

   

   radarhere committed Jun 26, 2019
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   8b447c4 View commit details

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