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diff --git a/env/lib/python3.10/site-packages/PIL/ImageStat.py b/env/lib/python3.10/site-packages/PIL/ImageStat.py
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-#
-# The Python Imaging Library.
-# $Id$
-#
-# global image statistics
-#
-# History:
-# 1996-04-05 fl Created
-# 1997-05-21 fl Added mask; added rms, var, stddev attributes
-# 1997-08-05 fl Added median
-# 1998-07-05 hk Fixed integer overflow error
-#
-# Notes:
-# This class shows how to implement delayed evaluation of attributes.
-# To get a certain value, simply access the corresponding attribute.
-# The __getattr__ dispatcher takes care of the rest.
-#
-# Copyright (c) Secret Labs AB 1997.
-# Copyright (c) Fredrik Lundh 1996-97.
-#
-# See the README file for information on usage and redistribution.
-#
-
-import functools
-import math
-import operator
-
-
-class Stat:
- def __init__(self, image_or_list, mask=None):
- try:
- if mask:
- self.h = image_or_list.histogram(mask)
- else:
- self.h = image_or_list.histogram()
- except AttributeError:
- self.h = image_or_list # assume it to be a histogram list
- if not isinstance(self.h, list):
- raise TypeError("first argument must be image or list")
- self.bands = list(range(len(self.h) // 256))
-
- def __getattr__(self, id):
- """Calculate missing attribute"""
- if id[:4] == "_get":
- raise AttributeError(id)
- # calculate missing attribute
- v = getattr(self, "_get" + id)()
- setattr(self, id, v)
- return v
-
- def _getextrema(self):
- """Get min/max values for each band in the image"""
-
- def minmax(histogram):
- n = 255
- x = 0
- for i in range(256):
- if histogram[i]:
- n = min(n, i)
- x = max(x, i)
- return n, x # returns (255, 0) if there's no data in the histogram
-
- v = []
- for i in range(0, len(self.h), 256):
- v.append(minmax(self.h[i:]))
- return v
-
- def _getcount(self):
- """Get total number of pixels in each layer"""
-
- v = []
- for i in range(0, len(self.h), 256):
- v.append(functools.reduce(operator.add, self.h[i : i + 256]))
- return v
-
- def _getsum(self):
- """Get sum of all pixels in each layer"""
-
- v = []
- for i in range(0, len(self.h), 256):
- layer_sum = 0.0
- for j in range(256):
- layer_sum += j * self.h[i + j]
- v.append(layer_sum)
- return v
-
- def _getsum2(self):
- """Get squared sum of all pixels in each layer"""
-
- v = []
- for i in range(0, len(self.h), 256):
- sum2 = 0.0
- for j in range(256):
- sum2 += (j**2) * float(self.h[i + j])
- v.append(sum2)
- return v
-
- def _getmean(self):
- """Get average pixel level for each layer"""
-
- v = []
- for i in self.bands:
- v.append(self.sum[i] / self.count[i])
- return v
-
- def _getmedian(self):
- """Get median pixel level for each layer"""
-
- v = []
- for i in self.bands:
- s = 0
- half = self.count[i] // 2
- b = i * 256
- for j in range(256):
- s = s + self.h[b + j]
- if s > half:
- break
- v.append(j)
- return v
-
- def _getrms(self):
- """Get RMS for each layer"""
-
- v = []
- for i in self.bands:
- v.append(math.sqrt(self.sum2[i] / self.count[i]))
- return v
-
- def _getvar(self):
- """Get variance for each layer"""
-
- v = []
- for i in self.bands:
- n = self.count[i]
- v.append((self.sum2[i] - (self.sum[i] ** 2.0) / n) / n)
- return v
-
- def _getstddev(self):
- """Get standard deviation for each layer"""
-
- v = []
- for i in self.bands:
- v.append(math.sqrt(self.var[i]))
- return v
-
-
-Global = Stat # compatibility