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
from wand.image import Image
with Image(filename = '../geeksforgeeks.png' ) as image:
with image.clone() as black_threshold:
black_threshold.black_threshold( 'Green' )
black_threshold.save(filename = 'black_threshold1.jpg' )
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Output:
Example 2:
Python3
from wand.image import Image
from wand.drawing import Drawing
from wand.color import Color
with Drawing() as draw:
draw.stroke_color = Color( 'black' )
draw.stroke_width = 1
draw.fill_color = Color( 'white' )
draw.circle(( 200 , 200 ),
( 100 , 100 ))
draw.font = '../Helvetica.ttf'
draw.font_size = 30
with Image(width = 400 , height = 400 , background = Color( '# 45ff33' )) as pic:
draw.text( int (pic.width / 3 ), int (pic.height / 2 ), 'GeeksForGeeks !' )
draw(pic)
pic.black_threshold( 'White' )
pic.save(filename = 'black_threshold2.jpg' )
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Output:
Last Updated :
08 Aug, 2022
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