
## Overview

`PIL` or **Python Imaging Library** is an image processing library in Python. This library supports a wide range of file formats. It is designed for an efficient internal representation of image data and provides powerful image processing capabilities.


## The `ImageFilter` Module

The `ImageFilter` module from `PIL` contains definitions for a predefined set of filters that are used for different purposes.

## The `MinFilter` function

The `MinFilter` function creates a min filter. This is used to pick the lowest pixel value in a window of a given size. 


## Syntax

```
PIL.ImageFilter.MinFilter(size=3)
```

## Parameter

- `size`: This represents the window size.

## The `MaxFilter` function

The `MaxFilter` function creates a min filter. This is used to pick the largest pixel value in a window of a given size.  


## Syntax

```
PIL.ImageFilter.MaxFilter(size=3)
```

## Parameter

- `size`: This represents the window size.


## Example

from PIL import Image, ImageFilter
import matplotlib.pyplot as plt

img = Image.open("man.png")

filter_size = 3

min_img = img.filter(ImageFilter.MinFilter(size=filter_size))

min_img.save("min_img.png")

max_img = img.filter(ImageFilter.MaxFilter(size=filter_size))

max_img.save("max_img.png")



python39


## Explanation

- Line 1: We import the `ImageFilter` and `Image` modules.
- Line 3: We use `open()` from the `Image` module to read `man.png` into memory.
- Line 5: We define the filter size, `filter_size`.
- Line 7: We apply the `MinFilter` with size as `filter_size` 
to the image we loaded in line 3.
- Line 9: We save the output of `MinFilter` to disk.
- Line 11: We apply the `MaxFilter` with size as `filter_size` 
to the image we loaded in line 3.
- Line 13: We save the output of `MaxFilter` to disk.

pillow.tar.gz

What are min and max filters in pillow in Python?

Pillow's MinFilter picks the lowest pixel value, while MaxFilter picks the highest, using a specified window size.

What are min and max filters in pillow in Python?

Overview

The ImageFilter Module

The MinFilter function

Syntax

Parameter

The MaxFilter function

Syntax

Parameter

Example

Explanation

The `ImageFilter` Module

The `MinFilter` function

The `MaxFilter` function