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Optimize ImageStat.Stat.extrema #7593

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merged 5 commits into from
Dec 6, 2023
Merged

Optimize ImageStat.Stat.extrema #7593

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1b8f9d3
Optimize ImageStat.Stat._getextrema function
florath Dec 1, 2023
7762dd3
Fixed spacing in _getextrema method
florath Dec 1, 2023
96fe0a1
Merge branch 'main' into ImageStat_getextrema_opt
radarhere Dec 2, 2023
ac47b75
Update src/PIL/ImageStat.py
florath Dec 4, 2023
ed03954
Merge branch 'main' into ImageStat_getextrema_opt
florath Dec 5, 2023
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13 changes: 8 additions & 5 deletions src/PIL/ImageStat.py
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Original file line number Diff line number Diff line change
Expand Up @@ -51,13 +51,16 @@ def _getextrema(self):
"""Get min/max values for each band in the image"""

def minmax(histogram):
n = 255
x = 0
res_min, res_max = 255, 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
res_min = i
break
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)]

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