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Python PIL | RankFilter() method

  • Last Updated : 27 Jun, 2019
PIL is the Python Imaging Library which provides the python interpreter with image editing capabilities. The ImageFilter module contains definitions for a pre-defined set of filters, which can be used with the Image.filter() method.

PIL.ImageFilter.RankFilter() creates a rank filter. The rank filter sorts all pixels in a window of the given size, and returns the rankā€™th value.

Syntax: PIL.ImageFilter.RankFilter(size, rank)

Parameters:
size: The kernel size, in pixels.
rank: What pixel value to pick. Use 0 for a min filter, size * size / 2 for a median filter, size * size – 1 for a max filter, etc.

Note: value for rank must be integer type.



Image used:




# Importing Image and ImageFilter module from PIL package  
from PIL import Image, ImageFilter 
     
# creating a image object 
im1 = Image.open(r"C:\Users\sadow984\Desktop\download2.JPG"
     
# applying the rank filter 
im2 = im1.filter(ImageFilter.RankFilter(size = 3, rank = 0)) 
     
im2.show() 

Output:




# Importing Image and ImageFilter module from PIL package  
from PIL import Image, ImageFilter 
     
# creating a image object 
im1 = Image.open(r"C:\Users\sadow984\Desktop\download2.JPG"
     
# applying the rank filter 
im2 = im1.filter(ImageFilter.RankFilter(size = 3, rank = 3 * 3-1)) 
     
im2.show() 

Output:




# Importing Image and ImageFilter module from PIL package  
from PIL import Image, ImageFilter 
     
# creating a image object 
im1 = Image.open(r"C:\Users\sadow984\Desktop\download2.JPG"
     
# applying the rank filter 
im2 = im1.filter(ImageFilter.RankFilter(size = 3, rank = (3 * 3)//2)) 
     
im2.show() 

Output:

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