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 image.
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 imagewith Image(filename ='../neveropen.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:
Python3
# Import libraries from the wand from wand.image import Imagefrom wand.drawing import Drawingfrom wand.color import Colorwith 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 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:
