vignette(()函数是Python Wand ImageMagick库中的内置函数,用于在图像上创建vignette-style效果,与图像中心相比,它会降低图像的亮度或饱和度。
用法:
vignette(radius, sigma, x, y)
参数:此函数接受上述和以下定义的四个参数:
- Radius:此参数存储高斯模糊效果的半径。
- Sigma:此参数存储高斯效应的标准偏差。
- x:此参数存储要从图像的顶部和底部向内偏移的像素数。
- y:此参数存储要从图像左右向内偏移的像素数。
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 vignette:
# Invoke vignette function with radius as 12, sigma as 10,
# x as 20, y as 20
vignette.vignette(12, 10, 20, 20)
# Save the image
vignette.save(filename ='vignette1.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 vignette function with radius as 12, sigma as 10, x as 10
# y as 10
pic.vignette(12, 10, 10, 10)
# Save the image
pic.save(filename ='vignette2.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 vignette() method – 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。