> I've attached a (preliminary) patch.
here's a sligtly less broken patch:
Index: PIL/ImageOps.py
===================================================================
--- PIL/ImageOps.py (revision 2134)
+++ PIL/ImageOps.py (working copy)
@@ -9,6 +9,7 @@
# 2001-10-23 fl Added autocontrast operator
# 2001-12-18 fl Added Kevin's fit operator
# 2004-03-14 fl Fixed potential division by zero in equalize
+# 2005-05-05 fl Fixed equalize for low number of values
#
# Copyright (c) 2001-2004 by Secret Labs AB
# Copyright (c) 2001-2004 by Fredrik Lundh
@@ -207,13 +208,18 @@
h = image.histogram(mask)
lut = []
for b in range(0, len(h), 256):
- step = reduce(operator.add, h[b:b+256]) / 255
- if step == 0:
- step = 1
- n = 0
- for i in range(256):
- lut.append(n / step)
- n = n + h[i+b]
+ histo = filter(None, h[b:b+256])
+ if len(histo) <= 1:
+ lut.extend(range(256))
+ else:
+ step = (reduce(operator.add, histo) - histo[-1]) / 255
+ if not step:
+ lut.extend(range(256))
+ else:
+ n = step / 2
+ for i in range(256):
+ lut.append(n / step)
+ n = n + h[i+b]
return _lut(image, lut)
##
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