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Merge pull request #7593 from florath/ImageStat_getextrema_opt

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Optimize ImageStat.Stat._getextrema function
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Andrew Murray 2023-12-06 17:27:56 +11:00 committed by GitHub
commit e9afaee248
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1 changed files with 8 additions and 5 deletions
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13
src/PIL/ImageStat.py
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@ -51,13 +51,16 @@ class Stat:
"""Get min/max values for each band in the image""" """Get min/max values for each band in the image"""
def minmax(histogram): def minmax(histogram):
n = 255 res_min, res_max = 255, 0
x = 0
for i in range(256): for i in range(256):
if histogram[i]: if histogram[i]:
n = min(n, i) res_min = i
x = max(x, i) break
return n, x # returns (255, 0) if there's no data in the histogram for i in range(255, -1, -1):
if histogram[i]:
res_max = i
break
return res_min, res_max
return [minmax(self.h[i:]) for i in range(0, len(self.h), 256)] return [minmax(self.h[i:]) for i in range(0, len(self.h), 256)]