本文整理汇总了Python中cpngfilters.convert_l_to_rgba方法的典型用法代码示例。如果您正苦于以下问题：Python cpngfilters.convert_l_to_rgba方法的具体用法？Python cpngfilters.convert_l_to_rgba怎么用？Python cpngfilters.convert_l_to_rgba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.convert_l_to_rgba方法的5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: convert_l_to_rgba
# 需要导入模块: import cpngfilters [as 别名]
# 或者: from cpngfilters import convert_l_to_rgba [as 别名]
def convert_l_to_rgba(row, result):
"""Convert a grayscale image to RGBA. This method assumes
the alpha channel in result is already correctly
initialized.
"""
for i in range(3):
result[i::4] = row 示例2: asRGBA
# 需要导入模块: import cpngfilters [as 别名]
# 或者: from cpngfilters import convert_l_to_rgba [as 别名]
def asRGBA(self):
"""Return image as RGBA pixels. Greyscales are expanded into
RGB triplets; an alpha channel is synthesized if necessary.
The return values are as for the :meth:`read` method
except that the *metadata* reflect the returned pixels, not the
source image. In particular, for this method
``metadata['greyscale']`` will be ``False``, and
``metadata['alpha']`` will be ``True``.
"""
width,height,pixels,meta = self.asDirect()
if meta['alpha'] and not meta['greyscale']:
return width,height,pixels,meta
typecode = 'BH'[meta['bitdepth'] > 8]
maxval = 2**meta['bitdepth'] - 1
maxbuffer = struct.pack('=' + typecode, maxval) * 4 * width
def newarray():
return array(typecode, maxbuffer)
if meta['alpha'] and meta['greyscale']:
# LA to RGBA
def convert():
for row in pixels:
# Create a fresh target row, then copy L channel
# into first three target channels, and A channel
# into fourth channel.
a = newarray()
pngfilters.convert_la_to_rgba(row, a)
yield a
elif meta['greyscale']:
# L to RGBA
def convert():
for row in pixels:
a = newarray()
pngfilters.convert_l_to_rgba(row, a)
yield a
else:
assert not meta['alpha'] and not meta['greyscale']
# RGB to RGBA
def convert():
for row in pixels:
a = newarray()
pngfilters.convert_rgb_to_rgba(row, a)
yield a
meta['alpha'] = True
meta['greyscale'] = False
return width,height,convert(),meta 示例3: asRGBA
# 需要导入模块: import cpngfilters [as 别名]
# 或者: from cpngfilters import convert_l_to_rgba [as 别名]
def asRGBA(self):
"""Return image as RGBA pixels. Greyscales are expanded into
RGB triplets; an alpha channel is synthesized if necessary.
The return values are as for the :meth:`read` method
except that the *metadata* reflect the returned pixels, not the
source image. In particular, for this method
``metadata['greyscale']`` will be ``False``, and
``metadata['alpha']`` will be ``True``.
"""
width,height,pixels,meta = self.asDirect()
if meta['alpha'] and not meta['greyscale']:
return width,height,pixels,meta
typecode = 'BH'[meta['bitdepth'] > 8]
maxval = 2**meta['bitdepth'] - 1
maxbuffer = struct.pack('=' + typecode, maxval) * 4 * width
def newarray():
return array(str(typecode), maxbuffer)
if meta['alpha'] and meta['greyscale']:
# LA to RGBA
def convert():
for row in pixels:
# Create a fresh target row, then copy L channel
# into first three target channels, and A channel
# into fourth channel.
a = newarray()
pngfilters.convert_la_to_rgba(row, a)
yield a
elif meta['greyscale']:
# L to RGBA
def convert():
for row in pixels:
a = newarray()
pngfilters.convert_l_to_rgba(row, a)
yield a
else:
assert not meta['alpha'] and not meta['greyscale']
# RGB to RGBA
def convert():
for row in pixels:
a = newarray()
pngfilters.convert_rgb_to_rgba(row, a)
yield a
meta['alpha'] = True
meta['greyscale'] = False
return width,height,convert(),meta 示例4: asRGBA
# 需要导入模块: import cpngfilters [as 别名]
# 或者: from cpngfilters import convert_l_to_rgba [as 别名]
def asRGBA(self):
"""Return image as RGBA pixels. Greyscales are expanded into
RGB triplets; an alpha channel is synthesized if necessary.
The return values are as for the :meth:`read` method
except that the *metadata* reflect the returned pixels, not the
source image. In particular, for this method
``metadata['greyscale']`` will be ``False``, and
``metadata['alpha']`` will be ``True``.
"""
width, height, pixels, meta = self.asDirect()
if meta['alpha'] and not meta['greyscale']:
return width, height, pixels, meta
typecode = 'BH' [meta['bitdepth'] > 8]
maxval = 2**meta['bitdepth'] - 1
maxbuffer = struct.pack('=' + typecode, maxval) * 4 * width
def newarray():
return array(typecode, maxbuffer)
if meta['alpha'] and meta['greyscale']:
# LA to RGBA
def convert():
for row in pixels:
# Create a fresh target row, then copy L channel
# into first three target channels, and A channel
# into fourth channel.
a = newarray()
pngfilters.convert_la_to_rgba(row, a)
yield a
elif meta['greyscale']:
# L to RGBA
def convert():
for row in pixels:
a = newarray()
pngfilters.convert_l_to_rgba(row, a)
yield a
else:
assert not meta['alpha'] and not meta['greyscale']
# RGB to RGBA
def convert():
for row in pixels:
a = newarray()
pngfilters.convert_rgb_to_rgba(row, a)
yield a
meta['alpha'] = True
meta['greyscale'] = False
return width, height, convert(), meta 示例5: asRGBA
# 需要导入模块: import cpngfilters [as 别名]
# 或者: from cpngfilters import convert_l_to_rgba [as 别名]
def asRGBA(self):
"""Return image as RGBA pixels. Greyscales are expanded into
RGB triplets; an alpha channel is synthesized if necessary.
The return values are as for the :meth:`read` method
except that the *metadata* reflect the returned pixels, not the
source image. In particular, for this method
``metadata['greyscale']`` will be ``False``, and
``metadata['alpha']`` will be ``True``.
"""
width, height, pixels, meta = self.asDirect()
if meta['alpha'] and not meta['greyscale']:
return width, height, pixels, meta
typecode = 'BH'[meta['bitdepth'] > 8]
maxval = 2 ** meta['bitdepth'] - 1
maxbuffer = struct.pack('=' + typecode, maxval) * 4 * width
def newarray():
return array(typecode, maxbuffer)
if meta['alpha'] and meta['greyscale']:
# LA to RGBA
def convert():
for row in pixels:
# Create a fresh target row, then copy L channel
# into first three target channels, and A channel
# into fourth channel.
a = newarray()
pngfilters.convert_la_to_rgba(row, a)
yield a
elif meta['greyscale']:
# L to RGBA
def convert():
for row in pixels:
a = newarray()
pngfilters.convert_l_to_rgba(row, a)
yield a
else:
assert not meta['alpha'] and not meta['greyscale']
# RGB to RGBA
def convert():
for row in pixels:
a = newarray()
pngfilters.convert_rgb_to_rgba(row, a)
yield a
meta['alpha'] = True
meta['greyscale'] = False
return width, height, convert(), meta