Wand black_threshold() function – Python
The black_threshold() function is an inbuilt function in the Python Wand ImageMagick library which is used to force all pixels above a given color as black and leaves all pixels above threshold unaltered.
Syntax:
black_threshold(color)Parameters: This function accepts single parameter as mentioned above and defined below:
- color: This parameter is used to specify the value of factor in order to apply black threshold. This parameter accepts values as color strings like ‘Green’, ‘Blue’, ‘Red’, ‘White’ etc.
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 ='../zambiatek.png') as image: # Clone the image in order to process with image.clone() as black_threshold: # Invoke black_threshold function with threshold parameter as 'Green' black_threshold.black_threshold('Green') # Save the image black_threshold.save(filename ='black_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 black_threshold function with threshold parameter as 'White' pic.black_threshold('White') # Save the image pic.save(filename ='black_threshold2.jpg') |
Output:
