Python Wand black_threshold()用法及代碼示例

black_threshold()函數是Python Wand ImageMagick庫中的內置函數，用於將高於給定顏色的所有像素強製為黑色，並保持閾值以上的所有像素不變。

 用法：

black_threshold(color)

參數：該函數接受上麵提到並在下麵定義的單個參數：

color:此參數用於指定因子值以應用黑色閾值。此參數接受諸如“綠色”，“藍色”，“紅色”，“白色”等顏色字符串的值。

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 black_threshold:
        # Invoke black_threshold function with threshold parameter as 'Green' 
        black_threshold.black_threshold('Green') 
        # Save the image 
        black_threshold.save(filename ='black_threshold1.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 black_threshold function with with threshold parameter as 'White' 
        pic.black_threshold('White') 
        # Save the image  
        pic.save(filename ='black_threshold2.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 black_threshold() 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。