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Wand clahe() function – Python

  • Last Updated : 10 Aug, 2021

The clahe() function is an inbuilt function in the Python Wand ImageMagick library which is used to contrast limited adaptive histogram equalization.


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clahe(width, height, number_bins, clip_limit)

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

  • width: This parameter stores the size of the region.
  • height: This parameter stores the size of the region.
  • number_bins: This parameter stores the histogram bins.
  • clip_limit: This parameter stores the contrast limit.

Return Value: This function returns the Wand ImageMagick object.

Original Image: 

Example 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 clahe:
        # Invoke clahe function
        clahe.clahe(300, 200, 3.4, 2.7)
        # Save the image ='clahe1.jpg')


Example 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 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, 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
        # Invoke clahe function
        pic.clahe(300, 200, 3.4, 2.7)
        # Save the image ='clahe2.jpg')



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