Wand blur() function – Python

The blur() function is an inbuilt function in the Python Wand ImageMagick library which is used to blur the image.

Syntax:

blur(radius, sigma, channel)

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

• radius: This parameter is used to specify the value of radius which is the size of the gaussian aperture.
• sigma: This parameter is used to specify the value of sigma which is the standard deviation of the gaussian filter.
• channel: This parameter is used to specify the value of image channel as undefined, ‘red’, ‘gray’, ‘cyan’, ‘green’, ‘magenta’, ‘blue’, ‘yellow’, ‘alpha’, ‘opacity’, ‘black’, ‘index’, ‘composite_channels’, ‘all_channels, ‘sync_channels’, ‘default_channels’.

Return Value: This function returns the Wand ImageMagick object.

Original Image:

Example 1:

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 blur:
        # Invoke blur function with radius as 10, sigma as 12
        # channel as 'Green'
        blur.blur(int(10), int(12), 'Green')
        # Save the image
        blur.save(filename ='blur1.jpg')

Output:

Example 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 blur function with radius as 200, sigma as 5
        # Channel as red
        pic.blur(int(200), int(5), 'Green')
        # Save the image
        pic.save(filename ='blur2.jpg')

Output: