Image Filters and Enhancements in Pillow

Pillow provides powerful tools to enhance and modify images using built-in filters and adjustments for brightness, contrast, and sharpness. These features allow for creative and practical image processing.

Using Built-in Filters

The ImageFilter module in Pillow provides several pre-defined filters that can be applied to images for artistic and functional effects.

Common Filters

Example: Applying Filters

from PIL import Image, ImageFilter
 
# Open an image
img = Image.open("example.jpg")
 
# Apply BLUR filter
blurred_img = img.filter(ImageFilter.BLUR)
blurred_img.show()
 
# Apply CONTOUR filter
contoured_img = img.filter(ImageFilter.CONTOUR)
contoured_img.show()
 
# Apply SHARPEN filter
sharpened_img = img.filter(ImageFilter.SHARPEN)
sharpened_img.show()

Adjusting Brightness, Contrast, and Sharpness

The ImageEnhance module allows you to adjust the brightness, contrast, sharpness, and color of an image.

Brightness Adjustment

Use ImageEnhance.Brightness to modify brightness levels.

from PIL import Image, ImageEnhance
 
# Open an image
img = Image.open("example.jpg")
 
# Enhance brightness
enhancer = ImageEnhance.Brightness(img)
bright_img = enhancer.enhance(1.5)  # Increase brightness by 50%
bright_img.show()

Contrast Adjustment

Use ImageEnhance.Contrast to adjust contrast.

# Enhance contrast
enhancer = ImageEnhance.Contrast(img)
high_contrast_img = enhancer.enhance(2.0)  # Double the contrast
high_contrast_img.show()

Sharpness Adjustment

Use ImageEnhance.Sharpness to control sharpness.

# Enhance sharpness
enhancer = ImageEnhance.Sharpness(img)
sharp_img = enhancer.enhance(3.0)  # Triple the sharpness
sharp_img.show()

Combining Filters and Enhancements

Filters and enhancements can be combined to achieve more complex effects.

Example: Create a Unique Effect

# Apply SHARPEN filter
sharpened_img = img.filter(ImageFilter.SHARPEN)
 
# Adjust brightness
enhancer = ImageEnhance.Brightness(sharpened_img)
bright_sharpened_img = enhancer.enhance(1.8)
bright_sharpened_img.show()

Try It Yourself

Problem 1: Apply Multiple Filters

Write a script to apply the DETAIL and EDGE_ENHANCE filters to an image named sample.jpg, and save the output as enhanced_sample.jpg.

from PIL import Image, ImageFilter
 
img = Image.open("sample.jpg")
detailed_img = img.filter(ImageFilter.DETAIL)
edge_img = detailed_img.filter(ImageFilter.EDGE_ENHANCE)
edge_img.save("enhanced_sample.jpg")
edge_img.show()

Problem 2: Adjust Brightness and Contrast

Write a script to increase the brightness by 30% and double the contrast of an image named sample.jpg.

from PIL import Image, ImageEnhance
 
img = Image.open("sample.jpg")
 
# Adjust brightness
brightness_enhancer = ImageEnhance.Brightness(img)
bright_img = brightness_enhancer.enhance(1.3)  # Increase brightness by 30%
 
# Adjust contrast
contrast_enhancer = ImageEnhance.Contrast(bright_img)
enhanced_img = contrast_enhancer.enhance(2.0)  # Double the contrast
 
enhanced_img.show()

Enhancing images with filters and adjustments can make them more visually appealing and suitable for various applications. Continue exploring these features to master image manipulation with Pillow!