本文整理匯總了Python中cpngfilters.undo_filter_paeth方法的典型用法代碼示例。如果您正苦於以下問題：Python cpngfilters.undo_filter_paeth方法的具體用法？Python cpngfilters.undo_filter_paeth怎麽用？Python cpngfilters.undo_filter_paeth使用的例子？那麽, 這裏精選的方法代碼示例或許可以為您提供幫助。您也可以進一步了解該方法所在類cpngfilters的用法示例。
在下文中一共展示了cpngfilters.undo_filter_paeth方法的1個代碼示例，這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚，您的評價將有助於係統推薦出更棒的Python代碼示例。
示例1: undo_filter_paeth
# 需要導入模塊: import cpngfilters [as 別名]
# 或者: from cpngfilters import undo_filter_paeth [as 別名]
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