albumentations

Fast image augmentation library and an easy-to-use wrapper around other libraries. Documentation: https://albumentations.ai/docs/ Paper about the library: https://www.mdpi.com/2078-2489/11/2/125

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Albumentations

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License: MIT
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⚠️ Important Notice: Albumentations is No Longer Maintained

This repository is no longer actively maintained. The last update was in June 2025, and no further bug fixes, features, or compatibility updates will be provided.

🚀 Introducing AlbumentationsX - The Future of Albumentations

All development has moved to AlbumentationsX, the next-generation successor to Albumentations.

Note: AlbumentationsX uses dual licensing (AGPL-3.0 / Commercial). The AGPL license has strict copyleft requirements - see details below.

Your Options Moving Forward

1. Continue Using Albumentations (MIT License)

  • ✅ Forever free for all uses including commercial
  • ✅ No licensing fees or restrictions
  • ❌ No bug fixes - Even critical bugs won’t be addressed
  • ❌ No new features - Missing out on performance improvements
  • ❌ No support - Issues and questions go unanswered
  • ❌ No compatibility updates - May break with new Python/PyTorch versions

Best for: Projects that work fine with the current version and don’t need updates

2. Upgrade to AlbumentationsX (Dual Licensed)

  • ✅ Drop-in replacement - Same API, just pip install albumentationsx
  • ✅ Active development - Regular updates and new features
  • ✅ Bug fixes - Issues are actively addressed
  • ✅ Performance improvements - Faster execution
  • ✅ Community support - Active Discord and issue tracking
  • ⚠️ Dual licensed:
    • AGPL-3.0: Free ONLY for projects licensed under AGPL-3.0 (not compatible with MIT, Apache, BSD, etc.)
    • Commercial License: Required for proprietary use AND permissive open-source projects

Best for: Projects that need ongoing support, updates, and new features

⚠️ AGPL License Warning: The AGPL-3.0 license is NOT compatible with permissive licenses like MIT, Apache 2.0, or BSD. If your project uses any of these licenses, you CANNOT use the AGPL version of AlbumentationsX - you’ll need a commercial license.

Migration is Simple

# Uninstall original
pip uninstall albumentations

# Install AlbumentationsX
pip install albumentationsx

That’s it! Your existing code continues to work without any changes:

import albumentations as A  # Same import!

transform = A.Compose([
    A.RandomCrop(width=256, height=256),
    A.HorizontalFlip(p=0.5),
    A.RandomBrightnessContrast(p=0.2),
])

Learn More

Original Albumentations README

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Albumentations is a Python library for image augmentation. Image augmentation is used in deep learning and computer vision tasks to increase the quality of trained models. The purpose of image augmentation is to create new training samples from the existing data.

Here is an example of how you can apply some pixel-level augmentations from Albumentations to create new images from the original one:
parrot

Why Albumentations

Table of contents

Authors

Current Maintainer

Vladimir I. Iglovikov | Kaggle Grandmaster

Emeritus Core Team Members

Mikhail Druzhinin | Kaggle Expert

Alex Parinov | Kaggle Master

Alexander Buslaev | Kaggle Master

Eugene Khvedchenya | Kaggle Grandmaster

Installation

Albumentations requires Python 3.9 or higher. To install the latest version from PyPI:

pip install -U albumentations

Other installation options are described in the documentation.

Documentation

The full documentation is available at https://albumentations.ai/docs/.

A simple example

import albumentations as A
import cv2

# Declare an augmentation pipeline
transform = A.Compose([
    A.RandomCrop(width=256, height=256),
    A.HorizontalFlip(p=0.5),
    A.RandomBrightnessContrast(p=0.2),
])

# Read an image with OpenCV and convert it to the RGB colorspace
image = cv2.imread("image.jpg")
image = cv2.cvtColor(image, cv2.COLOR_BGR2RGB)

# Augment an image
transformed = transform(image=image)
transformed_image = transformed["image"]

Getting started

I am new to image augmentation

Please start with the introduction articles about why image augmentation is important and how it helps to build better models.

I want to use Albumentations for the specific task such as classification or segmentation

If you want to use Albumentations for a specific task such as classification, segmentation, or object detection, refer to the set of articles that has an in-depth description of this task. We also have a list of examples on applying Albumentations for different use cases.

I want to explore augmentations and see Albumentations in action

Check the online demo of the library. With it, you can apply augmentations to different images and see the result. Also, we have a list of all available augmentations and their targets.

Who is using Albumentations














See also

List of augmentations

Pixel-level transforms

Pixel-level transforms will change just an input image and will leave any additional targets such as masks, bounding boxes, and keypoints unchanged. For volumetric data (volumes and 3D masks), these transforms are applied independently to each slice along the Z-axis (depth dimension), maintaining consistency across the volume. The list of pixel-level transforms:

Spatial-level transforms

Spatial-level transforms will simultaneously change both an input image as well as additional targets such as masks, bounding boxes, and keypoints. For volumetric data (volumes and 3D masks), these transforms are applied independently to each slice along the Z-axis (depth dimension), maintaining consistency across the volume. The following table shows which additional targets are supported by each transform:

  • Volume: 3D array of shape (D, H, W) or (D, H, W, C) where D is depth, H is height, W is width, and C is number of channels (optional)
  • Mask3D: Binary or multi-class 3D mask of shape (D, H, W) where each slice represents segmentation for the corresponding volume slice
Transform Image Mask BBoxes Keypoints Volume Mask3D
Affine ✓ ✓ ✓ ✓ ✓ ✓
AtLeastOneBBoxRandomCrop ✓ ✓ ✓ ✓ ✓ ✓
BBoxSafeRandomCrop ✓ ✓ ✓ ✓ ✓ ✓
CenterCrop ✓ ✓ ✓ ✓ ✓ ✓
CoarseDropout ✓ ✓ ✓ ✓ ✓ ✓
ConstrainedCoarseDropout ✓ ✓ ✓ ✓ ✓ ✓
Crop ✓ ✓ ✓ ✓ ✓ ✓
CropAndPad ✓ ✓ ✓ ✓ ✓ ✓
CropNonEmptyMaskIfExists ✓ ✓ ✓ ✓ ✓ ✓
D4 ✓ ✓ ✓ ✓ ✓ ✓
ElasticTransform ✓ ✓ ✓ ✓ ✓ ✓
Erasing ✓ ✓ ✓ ✓ ✓ ✓
FrequencyMasking ✓ ✓ ✓ ✓ ✓ ✓
GridDistortion ✓ ✓ ✓ ✓ ✓ ✓
GridDropout ✓ ✓ ✓ ✓ ✓ ✓
GridElasticDeform ✓ ✓ ✓ ✓ ✓ ✓
HorizontalFlip ✓ ✓ ✓ ✓ ✓ ✓
Lambda ✓ ✓ ✓ ✓ ✓ ✓
LongestMaxSize ✓ ✓ ✓ ✓ ✓ ✓
MaskDropout ✓ ✓ ✓ ✓ ✓ ✓
Morphological ✓ ✓ ✓ ✓ ✓ ✓
Mosaic ✓ ✓ ✓ ✓
NoOp ✓ ✓ ✓ ✓ ✓ ✓
OpticalDistortion ✓ ✓ ✓ ✓ ✓ ✓
OverlayElements ✓ ✓
Pad ✓ ✓ ✓ ✓ ✓ ✓
PadIfNeeded ✓ ✓ ✓ ✓ ✓ ✓
Perspective ✓ ✓ ✓ ✓ ✓ ✓
PiecewiseAffine ✓ ✓ ✓ ✓ ✓ ✓
PixelDropout ✓ ✓ ✓ ✓ ✓ ✓
RandomCrop ✓ ✓ ✓ ✓ ✓ ✓
RandomCropFromBorders ✓ ✓ ✓ ✓ ✓ ✓
RandomCropNearBBox ✓ ✓ ✓ ✓ ✓ ✓
RandomGridShuffle ✓ ✓ ✓ ✓ ✓ ✓
RandomResizedCrop ✓ ✓ ✓ ✓ ✓ ✓
RandomRotate90 ✓ ✓ ✓ ✓ ✓ ✓
RandomScale ✓ ✓ ✓ ✓ ✓ ✓
RandomSizedBBoxSafeCrop ✓ ✓ ✓ ✓ ✓ ✓
RandomSizedCrop ✓ ✓ ✓ ✓ ✓ ✓
Resize ✓ ✓ ✓ ✓ ✓ ✓
Rotate ✓ ✓ ✓ ✓ ✓ ✓
SafeRotate ✓ ✓ ✓ ✓ ✓ ✓
ShiftScaleRotate ✓ ✓ ✓ ✓ ✓ ✓
SmallestMaxSize ✓ ✓ ✓ ✓ ✓ ✓
SquareSymmetry ✓ ✓ ✓ ✓ ✓ ✓
ThinPlateSpline ✓ ✓ ✓ ✓ ✓ ✓
TimeMasking ✓ ✓ ✓ ✓ ✓ ✓
TimeReverse ✓ ✓ ✓ ✓ ✓ ✓
Transpose ✓ ✓ ✓ ✓ ✓ ✓
VerticalFlip ✓ ✓ ✓ ✓ ✓ ✓
XYMasking ✓ ✓ ✓ ✓ ✓ ✓

3D transforms

3D transforms operate on volumetric data and can modify both the input volume and associated 3D mask.

Where:

  • Volume: 3D array of shape (D, H, W) or (D, H, W, C) where D is depth, H is height, W is width, and C is number of channels (optional)
  • Mask3D: Binary or multi-class 3D mask of shape (D, H, W) where each slice represents segmentation for the corresponding volume slice
Transform Volume Mask3D Keypoints
CenterCrop3D ✓ ✓ ✓
CoarseDropout3D ✓ ✓ ✓
CubicSymmetry ✓ ✓ ✓
Pad3D ✓ ✓ ✓
PadIfNeeded3D ✓ ✓ ✓
RandomCrop3D ✓ ✓ ✓

A few more examples of augmentations

Semantic segmentation on the Inria dataset

inria

Medical imaging

medical

Object detection and semantic segmentation on the Mapillary Vistas dataset

vistas

Keypoints augmentation

Benchmark Results

Image Benchmark Results

System Information

  • Platform: macOS-15.1-arm64-arm-64bit
  • Processor: arm
  • CPU Count: 16
  • Python Version: 3.12.8

Benchmark Parameters

  • Number of images: 2000
  • Runs per transform: 5
  • Max warmup iterations: 1000

Library Versions

  • albumentations: 2.0.4
  • augly: 1.0.0
  • imgaug: 0.4.0
  • kornia: 0.8.0
  • torchvision: 0.20.1

Performance Comparison

Number shows how many uint8 images per second can be processed on one CPU thread. Larger is better.
The Speedup column shows how many times faster Albumentations is compared to the fastest other
library for each transform.

Transform albumentations
2.0.4		 augly
1.0.0		 imgaug
0.4.0		 kornia
0.8.0		 torchvision
0.20.1		 Speedup
(Alb/fastest other)
Affine 1445 ± 9 - 1328 ± 16 248 ± 6 188 ± 2 1.09x
AutoContrast 1657 ± 13 - - 541 ± 8 344 ± 1 3.06x
Blur 7657 ± 114 386 ± 4 5381 ± 125 265 ± 11 - 1.42x
Brightness 11985 ± 455 2108 ± 32 1076 ± 32 1127 ± 27 854 ± 13 5.68x
CLAHE 647 ± 4 - 555 ± 14 165 ± 3 - 1.17x
CenterCrop128 119293 ± 2164 - - - - N/A
ChannelDropout 11534 ± 306 - - 2283 ± 24 - 5.05x
ChannelShuffle 6772 ± 109 - 1252 ± 26 1328 ± 44 4417 ± 234 1.53x
CoarseDropout 18962 ± 1346 - 1190 ± 22 - - 15.93x
ColorJitter 1020 ± 91 418 ± 5 - 104 ± 4 87 ± 1 2.44x
Contrast 12394 ± 363 1379 ± 25 717 ± 5 1109 ± 41 602 ± 13 8.99x
CornerIllumination 484 ± 7 - - 452 ± 3 - 1.07x
Elastic 374 ± 2 - 395 ± 14 1 ± 0 3 ± 0 0.95x
Equalize 1236 ± 21 - 814 ± 11 306 ± 1 795 ± 3 1.52x
Erasing 27451 ± 2794 - - 1210 ± 27 3577 ± 49 7.67x
GaussianBlur 2350 ± 118 387 ± 4 1460 ± 23 254 ± 5 127 ± 4 1.61x
GaussianIllumination 720 ± 7 - - 436 ± 13 - 1.65x
GaussianNoise 315 ± 4 - 263 ± 9 125 ± 1 - 1.20x
Grayscale 32284 ± 1130 6088 ± 107 3100 ± 24 1201 ± 52 2600 ± 23 5.30x
HSV 1197 ± 23 - - - - N/A
HorizontalFlip 14460 ± 368 8808 ± 1012 9599 ± 495 1297 ± 13 2486 ± 107 1.51x
Hue 1944 ± 64 - - 150 ± 1 - 12.98x
Invert 27665 ± 3803 - 3682 ± 79 2881 ± 43 4244 ± 30 6.52x
JpegCompression 1321 ± 33 1202 ± 19 687 ± 26 120 ± 1 889 ± 7 1.10x
LinearIllumination 479 ± 5 - - 708 ± 6 - 0.68x
MedianBlur 1229 ± 9 - 1152 ± 14 6 ± 0 - 1.07x
MotionBlur 3521 ± 25 - 928 ± 37 159 ± 1 - 3.79x
Normalize 1819 ± 49 - - 1251 ± 14 1018 ± 7 1.45x
OpticalDistortion 661 ± 7 - - 174 ± 0 - 3.80x
Pad 48589 ± 2059 - - - 4889 ± 183 9.94x
Perspective 1206 ± 3 - 908 ± 8 154 ± 3 147 ± 5 1.33x
PlankianJitter 3221 ± 63 - - 2150 ± 52 - 1.50x
PlasmaBrightness 168 ± 2 - - 85 ± 1 - 1.98x
PlasmaContrast 145 ± 3 - - 84 ± 0 - 1.71x
PlasmaShadow 183 ± 5 - - 216 ± 5 - 0.85x
Posterize 12979 ± 1121 - 3111 ± 95 836 ± 30 4247 ± 26 3.06x
RGBShift 3391 ± 104 - - 896 ± 9 - 3.79x
Rain 2043 ± 115 - - 1493 ± 9 - 1.37x
RandomCrop128 111859 ± 1374 45395 ± 934 21408 ± 622 2946 ± 42 31450 ± 249 2.46x
RandomGamma 12444 ± 753 - 3504 ± 72 230 ± 3 - 3.55x
RandomResizedCrop 4347 ± 37 - - 661 ± 16 837 ± 37 5.19x
Resize 3532 ± 67 1083 ± 21 2995 ± 70 645 ± 13 260 ± 9 1.18x
Rotate 2912 ± 68 1739 ± 105 2574 ± 10 256 ± 2 258 ± 4 1.13x
SaltAndPepper 629 ± 6 - - 480 ± 12 - 1.31x
Saturation 1596 ± 24 - 495 ± 3 155 ± 2 - 3.22x
Sharpen 2346 ± 10 - 1101 ± 30 201 ± 2 220 ± 3 2.13x
Shear 1299 ± 11 - 1244 ± 14 261 ± 1 - 1.04x
Snow 611 ± 9 - - 143 ± 1 - 4.28x
Solarize 11756 ± 481 - 3843 ± 80 263 ± 6 1032 ± 14 3.06x
ThinPlateSpline 82 ± 1 - - 58 ± 0 - 1.41x
VerticalFlip 32386 ± 936 16830 ± 1653 19935 ± 1708 2872 ± 37 4696 ± 161 1.62x

Contributing

To create a pull request to the repository, follow the documentation at CONTRIBUTING.md

https://github.com/albuemntations-team/albumentation/graphs/contributors

Community

Citing

If you find this library useful for your research, please consider citing Albumentations: Fast and Flexible Image Augmentations:

@Article{info11020125,
    AUTHOR = {Buslaev, Alexander and Iglovikov, Vladimir I. and Khvedchenya, Eugene and Parinov, Alex and Druzhinin, Mikhail and Kalinin, Alexandr A.},
    TITLE = {Albumentations: Fast and Flexible Image Augmentations},
    JOURNAL = {Information},
    VOLUME = {11},
    YEAR = {2020},
    NUMBER = {2},
    ARTICLE-NUMBER = {125},
    URL = {https://www.mdpi.com/2078-2489/11/2/125},
    ISSN = {2078-2489},
    DOI = {10.3390/info11020125}
}

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