魔杖 local_contrast()函数- Python

local_contrast()函数是Python Wand ImageMagick 库中的一个内置函数，用于增加图像中的明暗过渡。

Syntax: 
 

Parameters: This function accepts two parameters as mentioned above and defined below: 
 

• radius: This parameter is used to store the size of the Gaussian operator. Default value is 10.0
• strength: This parameter is used to store the percentage of blur mask to apply. Default value is 12.5 and it can range from 0 to 100.

Return Value: This function returns the Wand ImageMagick object.

原图：

示例 1：

Python3

local_contrast(radius, strength)

Python3

# 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 local_contrast:
        # Invoke local_contrast function with radius 12 and sigma 3
        local_contrast.local_contrast(12, 3)
        # Save the image
        local_contrast.save(filename ='local_contrast1.jpg')

输出：

示例 2：

Python3

# 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 circle 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 local_contrast function with radius 15 and sigma 78
        pic.local_contrast(15, 78)
        # Save the image
        pic.save(filename ='local_contrast2.jpg')

输出：