Wand unsharp_mask() function – Python
unsharp_mask() is similar to normal sharpen() method in python Wand, but it gives control to blend between filter and original(amount parameter), and the threshold. When the amount value is greater than 1.0 more if the sharpen filter is applied, and less if the value is under 1.0. Values for threshold over 0.0 reduce the sharpens.
Syntax :
Python3
wand.image.unsharp_mask(radius, sigma, amount, threshold)
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Parameters :
Parameter |
Input Type |
Description |
radius |
numbers.Real |
Size of gaussian aperture. |
sigma |
numbers.Real |
the standard deviation of the Gaussian, in pixels. |
amount |
numbers.Real |
The percentage of the difference between the original and the blur image that is added back into the original |
threshold |
numbers.Real |
The threshold in pixels needed to apply the difference amount. |
Source Image :
Example 1:
Python3
from wand.image import Image
with Image(filename = "koala.jpeg" ) as img:
img.unsharp_mask(radius = 10 ,
sigma = 4 ,
amount = 1 ,
threshold = 0 )
img.save(filename = "unsharpmaskkoala.jpeg" )
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Output:
Example 2: Increasing threshold value to 0.5 and decreasing radius and sigma.
Python3
from wand.image import Image
with Image(filename = "koala.jpeg" ) as img:
img.unsharp_mask(radius = 8 ,
sigma = 4 ,
amount = 1 ,
threshold = 0.5 )
img.save(filename = "unsharpmaskkoala.jpeg" )
|
Output:
Last Updated :
10 Mar, 2023
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