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
# 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 sigmoidal_contrast: # Invoke sigmoidal_contrast function sigmoidal_contrast.sigmoidal_contrast(True, 10, 10) # Save the image sigmoidal_contrast.save(filename ='sigmoidal_contrast1.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 sigmoidal_contrast function method pic.sigmoidal_contrast(False, 5, 18) # Save the image pic.save(filename ='sigmoidal_contrast2.jpg') |
Output:
