Wand sigmoidal_contrast() function – Python
Last Updated :
13 Jul, 2021
The sigmoidal_contrast() function is an inbuilt function in the Python Wand ImageMagick library which is used to simulate a pencil sketch effect.
Syntax:
sigmoidal_contrast(sharpen, strength, midpoint, channel)
Parameters: This function accepts four parameters as mentioned above and defined below:
- sharpen: This is a boolean parameter which states sharpness is required or not.
- strength: This parameter stores the strength of the contrast.
- midpoint: This parameter stores the normalized value.
- channel: This parameter stores the available channel for interpolation.
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 sigmoidal_contrast:
sigmoidal_contrast.sigmoidal_contrast( True , 10 , 10 )
sigmoidal_contrast.save(filename = 'sigmoidal_contrast1.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.sigmoidal_contrast( False , 5 , 18 )
pic.save(filename = 'sigmoidal_contrast2.jpg' )
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Output:
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