python水印 resized_如何改进Python中的水印图像？
我正在使用python為來自this的水印圖像源代碼import Image
import ImageEnhance
import random
def _percent(var):
"""
Just a simple interface to the _val function with a more meaningful name.
"""
return _val(var, True)
def _int(var):
"""
Just a simple interface to the _val function with a more meaningful name.
"""
return _val(var)
def _val(var, is_percent=False):
"""
Tries to determine the appropriate value of a particular variable that is
passed in. If the value is supposed to be a percentage, a whole integer
will be sought after and then turned into a floating point number between
0 and 1. If the value is supposed to be an integer, the variable is cast
into an integer.
"""
try:
if is_percent:
var = float(int(var.strip('%')) / 100.0)
else:
var = int(var)
except ValueError:
raise ValueError('invalid watermark parameter: ' + var)
return var
def reduce_opacity(img, opacity):
"""
Returns an image with reduced opacity.
"""
assert opacity >= 0 and opacity <= 1
if img.mode != 'RGBA':
img = img.convert('RGBA')
else:
img = img.copy()
alpha = img.split()[3]
alpha = ImageEnhance.Brightness(alpha).enhance(opacity)
img.putalpha(alpha)
return img
def determine_scale(scale, img, mark):
"""
Scales an image using a specified ratio or 'F'. If `scale` is 'F', the
image is scaled to be as big as possible to fit in `img` without falling off
the edges. Returns the scaled `mark`.
"""
if scale:
try:
scale = float(scale)
except (ValueError, TypeError):
pass
if type(scale) in (str, unicode) and scale.lower() == 'f':
# scale, but preserve the aspect ratio
scale = min(
float(img.size[0]) / mark.size[0],
float(img.size[1]) / mark.size[1]
)
elif type(scale) not in (float, int):
raise ValueError(
'Invalid scale value "%s"! Valid values are 1) "F" for ratio-preserving scaling and 2) floating-point numbers and integers greater than 0.' % (
scale,))
# determine the new width and height
w = int(mark.size[0] * float(scale)) / 2
h = int(mark.size[1] * float(scale)) / 2
print w, h
# apply the new width and height, and return the new `mark`
return (w, h)
else:
print 'Mark Size', mark.size
return mark.size
def determine_rotation(rotation, mark):
"""
Determines the number of degrees to rotate the watermark image.
"""
if (isinstance(rotation, str) or isinstance(rotation, unicode)) \
and rotation.lower() == 'r':
rotation = random.randint(0, 359)
else:
rotation = _int(rotation)
return rotation
def determine_position(position, img, mark):
"""
Options:
TL: top-left
TR: top-right
BR: bottom-right
BL: bottom-left
C: centered
R: random
X%xY%: relative positioning on both the X and Y axes
X%xY: relative positioning on the X axis and absolute positioning on the
Y axis
XxY%: absolute positioning on the X axis and relative positioning on the
Y axis
XxY: absolute positioning on both the X and Y axes
"""
max_left = max(img.size[0] - mark.size[0], 0)
max_top = max(img.size[1] - mark.size[1], 0)
if not position:
position = 'r'
if isinstance(position, tuple):
left, top = position
elif isinstance(position, str) or isinstance(position, unicode):
position = position.lower()
# corner positioning
if position in ['tl', 'tr', 'br', 'bl']:
if 't' in position:
top = 0
elif 'b' in position:
top = max_top
if 'l' in position:
left = 0
elif 'r' in position:
left = max_left
# center positioning
elif position == 'c':
left = int(max_left / 2)
top = int(max_top / 2)
# random positioning
elif position == 'r':
left = random.randint(0, max_left)
top = random.randint(0, max_top)
# relative or absolute positioning
elif 'x' in position:
left, top = position.split('x')
if '%' in left:
left = max_left * _percent(left)
else:
left = _int(left)
if '%' in top:
top = max_top * _percent(top)
else:
top = _int(top)
print 'top left', left, top
return (left, top)
def watermark(img, mark, position=(0, 0), opacity=1, scale=1.0, tile=False,
greyscale=False, rotation=0, return_name=False, **kwargs):
"""
Adds a watermark to an image.
"""
if opacity < 1:
mark = reduce_opacity(mark, opacity)
if type(scale) != tuple:
scale = determine_scale(scale, img, mark)
print 'mark mode', mark.mode
mark = mark.resize(scale)
if greyscale and mark.mode != 'LA':
mark = mark.convert('LA')
rotation = determine_rotation(rotation, mark)
if rotation != 0:
# give some leeway for rotation overlapping
new_w = mark.size[0]
new_h = mark.size[1]
new_mark = Image.new('RGBA', (new_w, new_h), (0, 0, 0, 0))
# new_mark.putalpha()
# center the watermark in the newly resized image
new_l = (new_w - mark.size[0]) / 2
new_t = (new_h - mark.size[1]) / 2
new_mark.paste(mark, (new_l, new_t))
mark = new_mark.rotate(rotation, Image.BICUBIC, expand=True)
position = determine_position(position, img, mark)
print 'image mode', img.mode
print 'mark mode', mark.mode
if img.mode != 'RGBA':
img = img.convert('RGBA')
print 'image ---', img.mode
alpha = img.split()[3]
alpha = ImageEnhance.Brightness(alpha).enhance(opacity)
img.putalpha(alpha)
# make sure we have a tuple for a position now
assert isinstance(position, tuple), 'Invalid position "%s"!' % position
# create a transparent layer the size of the image and draw the
# watermark in that layer.
layer = Image.new('RGBA', img.size, (0, 0, 0, 0))
if tile:
first_y = position[1] % mark.size[1] - mark.size[1]
first_x = position[0] % mark.size[0] - mark.size[0]
for y in range(first_y, img.size[1], mark.size[1]):
for x in range(first_x, img.size[0], mark.size[0]):
layer.paste(mark, (x, y))
else:
layer.paste(mark, position)
# composite the watermark with the layer
return Image.composite(layer, img, layer)
def test():
im = Image.open('/home/chanhle/0450034_a (4th copy).jpg')
mark = Image.open('/home/chanhle/UMA LOGO.png')
# im.save('/home/chanhle/0120047_a.png')
watermark(im, mark,
position='C',
opacity=0.8,
scale='f',
rotation=45).save('/home/chanhle/test3.jpg', 'JPEG')
if __name__ == '__main__':
test()
這是我要加水印的圖像
這是logo
運行以上代碼時的結(jié)果
結(jié)果當(dāng)我使用在線工具時，它很漂亮。
正如你在結(jié)果中看到的標(biāo)志水印不夠尖銳，它不是美麗的，因為我的預(yù)期。
如何提高這種質(zhì)量？
感謝支持。在
總結(jié)
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