本文整理汇总了Python中cpngfilters.undo_filter_paeth方法的典型用法代码示例。如果您正苦于以下问题：Python cpngfilters.undo_filter_paeth方法的具体用法？Python cpngfilters.undo_filter_paeth怎么用？Python cpngfilters.undo_filter_paeth使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类cpngfilters的用法示例。
在下文中一共展示了cpngfilters.undo_filter_paeth方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Python代码示例。
示例1: undo_filter_paeth
# 需要导入模块: import cpngfilters [as 别名]
# 或者: from cpngfilters import undo_filter_paeth [as 别名]
def undo_filter_paeth(filter_unit, scanline, previous, result):
"""Undo Paeth filter."""
# Also used for ci.
ai = -filter_unit
for i in range(len(result)):
x = scanline[i]
if ai < 0:
a = c = 0
else:
a = result[ai]
c = previous[ai]
b = previous[i]
p = a + b - c
pa = abs(p - a)
pb = abs(p - b)
pc = abs(p - c)
if pa <= pb and pa <= pc:
pr = a
elif pb <= pc:
pr = b
else:
pr = c
result[i] = (x + pr) & 0xff
ai += 1