Python Wand unsharp_mask()用法及代码示例

unsharp_mask()函数是Python Wand ImageMagick库中的内置函数，用于锐化图像。此函数使用给定半径和标准偏差的高斯算符对图像进行卷积。

用法：

unsharp_mask(radius, sigma, amount, threshold, channel)

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。
Amount:此参数存储原始图像和添加回原始图像中的模糊图像之间的差异百分比。
Threshold:此参数将阈值存储在应用差异量所需的像素中。
Channel:此参数用于将图像通道的值指定为未定义的‘red’, ‘gray’，‘cyan’, ‘green’，‘magenta’, ‘blue’，‘yellow’, ‘alpha’，‘opacity’, ‘black’，‘index’, ‘composite_channels’，‘all_channels，‘sync_channels’, ‘default_channels’。

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 unsharp_mask:
        # Invoke unsharp_mask function with radius as 12, sigma as 10,  
        # amount as 0.5, threshold as 0.8 and channel as 'Green' 
        unsharp_mask.unsharp_mask(12, 10, 0.5, 0.8, 'Green') 
        # Save the image 
        unsharp_mask.save(filename ='unsharp_mask1.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 unsharp_mask function with radius as 10, sigma as 5,  
        # amount as 0.8, threshold as 0.5 and channel as 'Red' 
        pic.unsharp_mask(10, 5, 0.8, 0.5, 'Red') 
        # Save the image  
        pic.save(filename ='unsharp_mask2.jpg')

输出：

相关用法

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 unsharp_mask() 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。