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Wand threshold() function – Python
  • Last Updated : 04 May, 2020

The threshold() function is an inbuilt function in the Python Wand ImageMagick library which is used to modify the image such that any pixel’s intensity value greater than the threshold is assigned the maximum intensity (white), or otherwise is assigned the minimum intensity (black).

Syntax:

threshold(threshold, channel)

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

  • threshold: This parameter stores the threshold amount between 0 to 1.0.
  • height: This parameter stores the height of the thumbnail imag.

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 threshold:
        # Invoke threshold function with threshold as 0.3 and channel as 'green'
        threshold.threshold(0.3, 'green')
        # Save the image
        threshold.save(filename ='threshold1.jpg')

Output:

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 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 threshold function with threshold as 0.5 and channel as 'green'
        pic.threshold(0.5, 'green')
        # Save the image 
        pic.save(filename ='threshold2.jpg')

Output:

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