Python Wand unsharp_mask()用法及代碼示例

unsharp_mask()函數是Python Wand ImageMagick庫中的內置函數，用於銳化圖像。此函數使用給定半徑和標準偏差的高斯算符對圖像進行卷積。

用法：

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

參數：此函數接受上述和以下定義的四個參數：

Radius:此參數存儲高斯模糊效果的半徑。
Sigma:此參數存儲高斯效應的標準偏差。
Amount:此參數存儲原始圖像和添加回原始圖像中的模糊圖像之間的差異百分比。
Threshold:此參數將閾值存儲在應用差異量所需的像素中。
Channel:此參數用於將圖像通道的值指定為未定義的‘red’, ‘gray’，‘cyan’, ‘green’，‘magenta’, ‘blue’，‘yellow’, ‘alpha’，‘opacity’, ‘black’，‘index’, ‘composite_channels’，‘all_channels，‘sync_channels’, ‘default_channels’。

返回值：此函數返回Wand ImageMagick對象。

原始圖片：

範例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')

輸出：

範例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')

輸出：

相關用法

注：本文由純淨天空篩選整理自sarthak_ishu11大神的英文原創作品 Wand unsharp_mask() function – Python。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。