shadow()函数是Python Wand ImageMagick库中的内置函数，用于生成图像阴影。
用法：
shadow(alpha, sigma, x, y)
参数：此函数接受上述和以下定义的四个参数：
- alpha:此参数存储透明度的比率。
- sigma:此参数存储锐化图像的sigma级别。
- x:此参数存储x-offset。
- y:此参数存储y-offset。
返回值：此函数返回Wand ImageMagick对象。
原始图片：
范例1：
# Import library from Image
from wand.image import Image
# Import the image
with Image(filename ='../geeksforgeeks.png') as image:
# Clone the image in order to process
with image.clone() as shadow:
# Invoke shadow function
shadow.shadow(0.8, 0.2, 10, 40)
# Save the image
shadow.save(filename ='shadow1.jpg')输出：
范例2：
# Import libraries from the wand
from wand.image import Image
from wand.drawing import Drawing
from wand.color import Color
with Drawing() as draw:
# Set Stroke color the circle to black
draw.stroke_color = Color('black')
# Set Width of the circlw to 2
draw.stroke_width = 1
# Set the fill color to 'White (# FFFFFF)'
draw.fill_color = Color('white')
# Invoke Circle function with center at 50, 50 and radius 25
draw.circle((200, 200), # Center point
(100, 100)) # Perimeter point
# Set the font style
draw.font = '../Helvetica.ttf'
# Set the font size
draw.font_size = 30
with Image(width = 400, height = 400, background = Color('# 45ff33')) as pic:
# Set the text and its location
draw.text(int(pic.width / 3), int(pic.height / 2), 'GeeksForGeeks !')
# Draw the picture
draw(pic)
# Invoke shadow function method
pic.shadow(0.3, .1, 1, 2)
# Save the image
pic.save(filename ='shadow2.jpg')输出：
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注：本文由纯净天空筛选整理自sarthak_ishu11大神的英文原创作品 Wand shadow() function – Python。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。