Wand unsharp_mask() function – Python
Last Updated :
08 Jul, 2021
The unsharp_mask() function is an inbuilt function in the Python Wand ImageMagick library which is used to sharpen an image. This function convolves the image with a Gaussian operator of the given radius and standard deviation.
Syntax:
unsharp_mask(radius, sigma, amount, threshold, channel)
Parameters: This function accepts four parameters as mentioned above and defined below:
- Radius: This parameter stores the radius of the Gaussian blur effect.
- Sigma: This parameter stores the standard deviation of the Gaussian effect.
- Amount: This parameter stores the percentage of the difference between the original and the blur image that is added back into the original.
- Threshold: This parameter stores the threshold in pixels needed to apply the difference amount.
- Channel: This parameter is used to specify the value of image channel as undefined, ‘red’, ‘gray’, ‘cyan’, ‘green’, ‘magenta’, ‘blue’, ‘yellow’, ‘alpha’, ‘opacity’, ‘black’, ‘index’, ‘composite_channels’, ‘all_channels, ‘sync_channels’, ‘default_channels’.
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 unsharp_mask:
unsharp_mask.unsharp_mask( 12 , 10 , 0.5 , 0.8 , 'Green' )
unsharp_mask.save(filename = 'unsharp_mask1.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.unsharp_mask( 10 , 5 , 0.8 , 0.5 , 'Red' )
pic.save(filename = 'unsharp_mask2.jpg' )
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Output:
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