The local_contrast() function is an inbuilt function in the Python Wand ImageMagick library which is used to increase light-dark transitions within the image.
Syntax:
local_contrast(radius, strength)Parameters: This function accepts two parameters as mentioned above and defined below:
- radius: This parameter is used to store the size of the Gaussian operator. Default value is 10.0
- strength: This parameter is used to store the percentage of blur mask to apply. Default value is 12.5 and it can range from 0 to 100.
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 image with Image(filename = '../geeksforgeeks.png' ) as image:
# Clone the image in order to process
with image.clone() as local_contrast:
# Invoke local_contrast function with radius 12 and sigma 3
local_contrast.local_contrast( 12 , 3 )
# Save the image
local_contrast.save(filename = 'local_contrast1.jpg' )
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Output:
Example 2:
Python3
# 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
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 local_contrast function with radius 15 and sigma 78
pic.local_contrast( 15 , 78 )
# Save the image
pic.save(filename = 'local_contrast2.jpg' )
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Output: