本文整理汇总了Python中PIL.PngImagePlugin类的典型用法代码示例。如果您正苦于以下问题：Python PngImagePlugin类的具体用法？Python PngImagePlugin怎么用？Python PngImagePlugin使用的例子？那么, 这里精选的类代码示例或许可以为您提供帮助。
在下文中一共展示了PngImagePlugin类的7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: test_roundtrip_itxt
def test_roundtrip_itxt(self):
# Check iTXt roundtripping
im = Image.new("RGB", (32, 32))
info = PngImagePlugin.PngInfo()
info.add_itxt("spam", "Eggs", "en", "Spam")
info.add_text("eggs", PngImagePlugin.iTXt("Spam", "en", "Eggs"), zip=True)
im = roundtrip(im, pnginfo=info)
self.assertEqual(im.info, {"spam": "Eggs", "eggs": "Spam"})
self.assertEqual(im.text, {"spam": "Eggs", "eggs": "Spam"})
self.assertEqual(im.text["spam"].lang, "en")
self.assertEqual(im.text["spam"].tkey, "Spam")
self.assertEqual(im.text["eggs"].lang, "en")
self.assertEqual(im.text["eggs"].tkey, "Eggs")示例2: chunk
def chunk(cid, *data):
file = BytesIO()
PngImagePlugin.putchunk(*(file, cid) + data)
return file.getvalue()示例3: test_getchunks
def test_getchunks(self):
im = hopper()
chunks = PngImagePlugin.getchunks(im)
self.assertEqual(len(chunks), 3)示例4: load_icon
def load_icon(_imgPath, index=None):
if isinstance(_imgPath, basestring):
file = open(_imgPath, 'rb')
try:
header = struct.unpack('<3H', file.read(6))
except:
raise IOError('Not an ICO file')
# Check magic
try:
if header[:2] != (0, 1):
raise IOError('Not an ICO file')
except:
return loadPNG(_imgPath)
# Collect icon directories
directories = []
for i in xrange(header[2]):
directory = list(struct.unpack('<4B2H2I', file.read(16)))
for j in xrange(3):
if not directory[j]:
directory[j] = 256
directories.append(directory)
if index is None:
# Select best icon
directory = max(directories, key=operator.itemgetter(slice(0, 3)))
else:
directory = directories[index]
# Seek to the bitmap data
file.seek(directory[7])
prefix = file.read(16)
file.seek(-16, 1)
if PngImagePlugin._accept(prefix):
# Windows Vista icon with PNG inside
image = PngImagePlugin.PngImageFile(file)
else:
# Load XOR bitmap
image = BmpImagePlugin.DibImageFile(file)
if image.mode == 'RGBA':
# Windows XP 32-bit color depth icon without AND bitmap
pass
else:
# Patch up the bitmap height
image.size = image.size[0], image.size[1] >> 1
d, e, o, a = image.tile[0]
image.tile[0] = d, (0, 0) + image.size, o, a
# Calculate AND bitmap dimensions. See
offset = o + a[1] * image.size[1]
stride = ((image.size[0] + 31) >> 5) << 2
size = stride * image.size[1]
# Load AND bitmap
file.seek(offset)
string = file.read(size)
mask = Image.frombytes('1', image.size, string, 'raw',
('1;I', stride, -1))
image = image.convert('RGBA')
image.putalpha(mask)
return image, image.size示例5: load_icon
def load_icon(file, index=None):
'''
Load Windows ICO image.
See http://en.wikipedia.org/w/index.php?oldid=264332061 for file format
description.
'''
if isinstance(file, basestring):
file = open(file, 'rb')
header = struct.unpack('<3H', file.read(6))
# Check magic
if header[:2] != (0, 1):
raise SyntaxError('Not an ICO file')
# Collect icon directories
directories = []
for i in xrange(header[2]):
directory = list(struct.unpack('<4B2H2I', file.read(16)))
for j in xrange(3):
if not directory[j]:
directory[j] = 256
directories.append(directory)
if index is None:
# Select best icon
directory = max(directories, key=operator.itemgetter(slice(0, 3)))
else:
directory = directories[index]
# Seek to the bitmap data
file.seek(directory[7])
prefix = file.read(16)
file.seek(-16, 1)
if PngImagePlugin._accept(prefix):
# Windows Vista icon with PNG inside
image = PngImagePlugin.PngImageFile(file)
else:
# Load XOR bitmap
image = BmpImagePlugin.DibImageFile(file)
if image.mode == 'RGBA':
# Windows XP 32-bit color depth icon without AND bitmap
pass
else:
# Patch up the bitmap height
image.size = image.size[0], image.size[1] >> 1
d, e, o, a = image.tile[0]
image.tile[0] = d, (0, 0) + image.size, o, a
# Calculate AND bitmap dimensions. See
# http://en.wikipedia.org/w/index.php?oldid=264236948#Pixel_storage
# for description
offset = o + a[1] * image.size[1]
stride = ((image.size[0] + 31) >> 5) << 2
size = stride * image.size[1]
# Load AND bitmap
file.seek(offset)
string = file.read(size)
mask = Image.fromstring('1', image.size, string, 'raw',
('1;I', stride, -1))
image = image.convert('RGBA')
image.putalpha(mask)
return image示例6: max
directories.append(directory)
if index is None:
# Select best icon
directory = max(directories, key=operator.itemgetter(slice(0, 3)))
else:
directory = directories[index]
# Seek to the bitmap data
image_file.seek(directory[7])
prefix = image_file.read(16)
image_file.seek(-16, 1)
if PngImagePlugin._accept(prefix):
# Windows Vista icon with PNG inside
try:
image = PngImagePlugin.PngImageFile(image_file)
except IOError:
return
else:
# Load XOR bitmap
try:
image = BmpImagePlugin.DibImageFile(image_file)
except IOError:
return
if image.mode == 'RGBA':
# Windows XP 32-bit color depth icon without AND bitmap
pass
else:示例7: IHDR
while True:
s = fp.read(629)
print s
if not s:
break
p.feed(s)
im = p.close()
im.save("o2.png")
#im.show()
# chunky = png.PngStream(im)
chunks_are_us = png.getchunks(fp)
#for item in chunks_are_us:
#print item[0]
#this returns these:
# IHDR (required)
# IDAT (image data chunk 1)
# IDAT (image data chunk 2)
# IEND (required)
#no itXt chunk or other metadata
#this works but is not informative
# for k,v in im.info.iteritems():
# print k,v