Albumentations 1.4.2 adds the Chromatic Aberration transform. This feature simulates the common lens aberration effect, causing color fringes in images due to the lens's inability to focus all colors at the same convergence point.

Understanding Chromatic Aberration

Chromatic Aberration results from lens dispersion, where light of different wavelengths refracts at slightly varied angles.

The Albumentations library introduces this as a visual effect rather than a precise optical simulation, offering two modes to mimic the appearance of chromatic aberration: green_purple and red_blue.

Enhancing Model Robustness

Applying the Chromatic Aberration transform can increase a model's robustness to real-world imaging conditions. It's particularly relevant for:

• High-contrast scenes
• Wide apertures photography
• Telephoto lens usage
• Digital zooming
• Underwater and action photography

Code Example

Original image

transform = A.Compose([A.ChromaticAberration(mode="red_blue", 
primary_distortion_limit=0.5, 
secondary_distortion_limit=0.1, 
p=1)], p=1)

transformed = transform(image=img)["image"]

Or as a part of the more general pipeline.

transform = A.Compose([
    A.RandomCrop(height=300, width=200, p=1),
    A.HorizontalFlip(p=0.5),    
    A.ChromaticAberration(p=0.5, 
                          primary_distortion_limit=0.5, 
                          secondary_distortion_limit=0.1, 
                          mode='random'),
    A.GaussNoise(p=0.5)
])