Acquire Zarr streaming library

This library supports chunked, compressed, multiscale streaming to Zarr version 3, with OME-NGFF metadata.

This code builds targets for Python and C.

For complete documentation, please visit the Acquire documentation site.

Installing

Precompiled binaries

C headers and precompiled binaries are available for Windows, Mac, and Linux on our releases page.

Python

The library is available on PyPI and can be installed using pip:

pip install acquire-zarr

Local Development Quickstart

The included justfile provides recipes for common development tasks. Install uv, if you don't have it already, and then Install just with your package manager of choice (e.g. brew install just).

# setup everything and install python bindings (using python 3.13, optional)
just install -p 3.13
# run python tests
just test

Run just without arguments to see all available recipes:

Available recipes:
    clean          # Clean build artifacts (keeps vcpkg)
    clean-all      # Clean everything including vcpkg
    cmake-build    # Requires cmake installed (e.g., `brew install cmake` or `uv tool install cmake`)
    install *args  # (args are passed to uv sync, e.g.: `just install -p 3.12`)
    setup-vcpkg    # Setup vcpkg (clone and bootstrap if needed)
    test *args     # (args are passed to pytest, e.g.: `just test -k test_function`)
    test-cpp *args # (args are passed to ctest, e.g.: `just test-cpp -R unit`)
    update-vcpkg   # Update vcpkg to latest
    uv-sync *args  # Run uv sync (includes testing dependencies)

Docker

Build and run the tests in a container:

docker build -t acquire-zarr .
docker run --rm acquire-zarr

Building

Installing dependencies

This library has the following dependencies:

c-blosc v1.21.5
nlohmann-json v3.11.3
minio-cpp v0.3.0
crc32c v1.1.2

We use vcpkg to install them, as it integrates well with CMake. To install vcpkg, clone the repository and bootstrap it:

git clone https://github.com/microsoft/vcpkg.git
cd vcpkg && ./bootstrap-vcpkg.sh

and then add the vcpkg directory to your path. If you are using bash, you can do this by running the following snippet from the vcpkg/ directory:

cat >> ~/.bashrc <<EOF
export VCPKG_ROOT=${PWD}
export PATH=\$VCPKG_ROOT:\$PATH
EOF

If you're using Windows, learn how to set environment variables here. You will need to set both the VCPKG_ROOT and PATH variables in the system control panel.

On the Mac, you will also need to install OpenMP using Homebrew:

brew install libomp

Configuring

To build the library, you can use CMake:

cmake --preset=default -B /path/to/build /path/to/source

On Windows, you'll need to specify the target triplet to ensure that all dependencies are built as static libraries:

cmake --preset=default -B /path/to/build -DVCPKG_TARGET_TRIPLET=x64-windows-static /path/to/source

Aside from the usual CMake options, you can choose to disable tests by setting BUILD_TESTING to OFF:

cmake --preset=default -B /path/to/build -DBUILD_TESTING=OFF /path/to/source

To build the Python bindings, make sure pybind11 is installed. Then, you can set BUILD_PYTHON to ON:

cmake --preset=default -B /path/to/build -DBUILD_PYTHON=ON /path/to/source

Building

After configuring, you can build the library:

cmake --build /path/to/build

Installing for Python

To install the Python bindings, you can run:

pip install .

[!NOTE] It is highly recommended to use virtual environments for Python, e.g. using venv or conda. In this case, make sure pybind11 is installed in this environment, and that the environment is activated before installing the bindings.

Usage

The library provides two main interfaces. First, ZarrStream, representing an output stream to a Zarr dataset. Second, ZarrStreamSettings to configure a Zarr stream.

A typical use case for a single-array, 4-dimensional acquisition might look like this:

ZarrArraySettings array{
    .output_key =
      "my-array", // Optional: path within Zarr where data should be stored
    .data_type = ZarrDataType_uint16,
};

ZarrArraySettings_create_dimension_array(&array, 4);
array.dimensions[0] = (ZarrDimensionProperties){
    .name = "t",
    .type = ZarrDimensionType_Time,
    .array_size_px = 0,      // this is the append dimension
    .chunk_size_px = 100,    // 100 time points per chunk
    .shard_size_chunks = 10, // 10 chunks per shard
};

// ... rest of dimensions configuration ...

ZarrStreamSettings settings = (ZarrStreamSettings){
    .store_path = "my_stream.zarr",
    .overwrite = true, // Optional: remove existing data at store_path if true
    .arrays = &array,
    .array_count = 1, // Number of arrays in the stream
};

ZarrStream* stream = ZarrStream_create(&settings);

// You can now safely free the dimensions array
ZarrArraySettings_destroy_dimension_array(&array);

size_t bytes_written;
ZarrStream_append(stream,
                  my_frame_data,
                  my_frame_size,
                  &bytes_written,
                  "my-array"); // if you have just one array configured, this can be NULL
assert(bytes_written == my_frame_size);

Look at acquire.zarr.h for more details.

This acquisition in Python would look like this:

import acquire_zarr as aqz
import numpy as np

settings = aqz.StreamSettings(
    store_path="my_stream.zarr",
    overwrite=True  # Optional: remove existing data at store_path if true
)

settings.arrays = [
    aqz.ArraySettings(
        output_key="array1",
        data_type=np.uint16,
        dimensions = [
            aqz.Dimension(
                name="t",
                kind=aqz.DimensionType.TIME,
                array_size_px=0,
                chunk_size_px=100,
                shard_size_chunks=10
            ),
            aqz.Dimension(
                name="c",
                kind=aqz.DimensionType.CHANNEL,
                array_size_px=3,
                chunk_size_px=1,
                shard_size_chunks=1
            ),
            aqz.Dimension(
                name="y",
                kind=aqz.DimensionType.SPACE,
                array_size_px=1080,
                chunk_size_px=270,
                shard_size_chunks=2
            ),
            aqz.Dimension(
                name="x",
                kind=aqz.DimensionType.SPACE,
                array_size_px=1920,
                chunk_size_px=480,
                shard_size_chunks=2
            )
        ]
    )
]

# Generate some random data: one time point, all channels, full frame
my_frame_data = np.random.randint(0, 2 ** 16, (3, 1080, 1920), dtype=np.uint16)

stream = aqz.ZarrStream(settings)
stream.append(my_frame_data)

# ... append more data as needed ...

# When done, close the stream to flush any remaining data
stream.close()

Understanding the output hierarchy

The Zarr hierarchy produced by a stream depends on output_key and downsampling_method:

`output_key`	`downsampling_method`	Result at `store_path`
`""` (empty)	`None`	Simple array at `store_path/`
`"myarray"`	`None`	Simple array at `store_path/myarray/`
`""` (empty)	set (e.g. `MEAN`)	OME-NGFF multiscales group at `store_path/`, array at `store_path/0/`
`"myarray"`	set (e.g. `MEAN`)	OME-NGFF multiscales group at `store_path/myarray/`, array at `store_path/myarray/0/`

When downsampling_method is set, an OME-NGFF multiscales group is created at store_path/output_key/ (or at store_path/ if output_key is empty), containing the full-resolution array at level 0 plus additional downsampled levels. The number of levels is determined automatically from the chunk and array sizes. You can cap the pyramid depth with max_levels (0 means no limit, which is the default).

Organizing data within a Zarr container

The library allows you to stream multiple arrays to a single Zarr dataset by configuring multiple arrays. For example, a multichannel acquisition with both brightfield and fluorescence channels might look like this:

import acquire_zarr as aqz
import numpy as np

# configure the stream with two arrays
settings = aqz.StreamSettings(
    store_path="experiment.zarr",
    overwrite=True,  # Remove existing data at store_path if true
    arrays=[
        aqz.ArraySettings(
            output_key="sample1/brightfield",
            data_type=np.uint16,
            dimensions=[
                aqz.Dimension(
                    name="t",
                    kind=aqz.DimensionType.TIME,
                    array_size_px=0,
                    chunk_size_px=100,
                    shard_size_chunks=1
                ),
                aqz.Dimension(
                    name="c",
                    kind=aqz.DimensionType.CHANNEL,
                    array_size_px=1,
                    chunk_size_px=1,
                    shard_size_chunks=1
                ),
                aqz.Dimension(
                    name="y",
                    kind=aqz.DimensionType.SPACE,
                    array_size_px=1080,
                    chunk_size_px=270,
                    shard_size_chunks=2
                ),
                aqz.Dimension(
                    name="x",
                    kind=aqz.DimensionType.SPACE,
                    array_size_px=1920,
                    chunk_size_px=480,
                    shard_size_chunks=2
                )
            ]
        ),
        aqz.ArraySettings(
            output_key="sample1/fluorescence",
            data_type=np.uint16,
            dimensions=[
                aqz.Dimension(
                    name="t",
                    kind=aqz.DimensionType.TIME,
                    array_size_px=0,
                    chunk_size_px=100,
                    shard_size_chunks=1
                ),
                aqz.Dimension(
                    name="c",
                    kind=aqz.DimensionType.CHANNEL,
                    array_size_px=2,  # two fluorescence channels
                    chunk_size_px=1,
                    shard_size_chunks=1
                ),
                aqz.Dimension(
                    name="y",
                    kind=aqz.DimensionType.SPACE,
                    array_size_px=1080,
                    chunk_size_px=270,
                    shard_size_chunks=2
                ),
                aqz.Dimension(
                    name="x",
                    kind=aqz.DimensionType.SPACE,
                    array_size_px=1920,
                    chunk_size_px=480,
                    shard_size_chunks=2
                )
            ]
        )
    ]
)

stream = aqz.ZarrStream(settings)

# ... append data ...
stream.append(brightfield_frame_data, key="sample1/brightfield")
stream.append(fluorescence_frame_data, key="sample1/fluorescence")

# ... append more data as needed ...

# When done, close the stream to flush any remaining data
stream.close()

The overwrite parameter controls whether existing data at the store_path is removed. When set to true, the entire directory specified by store_path will be removed if it exists. When set to false, the stream will use the existing directory if it exists, or create a new one if it doesn't.

Writing custom metadata

Custom metadata can be written to any array in the stream using ZarrStream_write_custom_metadata (C) or stream.write_custom_metadata (Python). Metadata is written under the attributes key of the target array's zarr.json file, which is the standard location for user-defined metadata in Zarr v3.

The function takes three parameters:

array_key: The key of the array to write metadata to, matching the output_key set when configuring the array (see the array configuration examples above). If NULL (C) or None (Python) and the stream has only one array, that array is targeted automatically. Required when the stream has multiple arrays.
metadata_key: An optional key under attributes to nest the metadata under. If NULL/None or empty, metadata is written directly under attributes.
metadata: A JSON-formatted string containing the metadata to write.

[!NOTE] The ome key under attributes is reserved for OME-NGFF metadata and cannot be used as a metadata_key. Passing "ome" or, if no metadata key is provided, if any child of the metadata object has a key of "ome", the function will return an error.

In C:

// Write directly under 'attributes'
ZarrStream_write_custom_metadata(stream,
                                 "my-array",   // array_key
                                 NULL,          // metadata_key: write under 'attributes'
                                 "{\"device\": \"motor-1\", \"position\": 42}");

// Write under 'attributes/device'
ZarrStream_write_custom_metadata(stream,
                                 "my-array",
                                 "device",
                                 "{\"name\": \"motor-1\", \"position\": 42}");

In Python:

import json

# Write as a dict directly under 'attributes'
stream.write_custom_metadata(
    {"device": "motor-1", "position": 42},
    array_key="my-array"
)

# Write as a string directly under 'attributes'
stream.write_custom_metadata(
    json.dumps({"device": "motor-1", "position": 42}),
    array_key="my-array"
)

# Write under 'attributes/device'
stream.write_custom_metadata(
    {"name": "motor-1", "position": 42},
    array_key="my-array",
    metadata_key="device"
)

Metadata can be written at any point while the stream is active and will be flushed to disk when the stream is closed.

High-content screening workflows

The library supports high-content screening (HCS) datasets following the OME-NGFF 0.5 specification. HCS data is organized into plates, wells, and fields of view, with automatic generation of appropriate metadata.

Here's an example of creating an HCS dataset in Python:

import acquire_zarr as aqz
import numpy as np

# Create acquisition metadata
acquisition = aqz.Acquisition(
    id=0,
    name="Measurement_01",
    start_time=1343731272000,  # Unix timestamp in milliseconds
    end_time=1343737645000
)

# Configure wells with fields of view
well_a1 = aqz.Well(
    row_name="A",
    column_name="1",
    images=[
        aqz.FieldOfView(
            path="fov1", # Relative to the well: plate/A/1/fov1
            acquisition_id=0,
            array_settings=aqz.ArraySettings(
                output_key=None, # must be None for an FOV array; path is specified as a member of FieldOfView 
                data_type=np.uint16,
                dimensions=[
                    aqz.Dimension(
                        name="t",
                        kind=aqz.DimensionType.TIME,
                        array_size_px=0,
                        chunk_size_px=10,
                        shard_size_chunks=1
                    ),
                    aqz.Dimension(
                        name="c",
                        kind=aqz.DimensionType.CHANNEL,
                        array_size_px=3,
                        chunk_size_px=1,
                        shard_size_chunks=1
                    ),
                    aqz.Dimension(
                        name="y",
                        kind=aqz.DimensionType.SPACE,
                        array_size_px=512,
                        chunk_size_px=256,
                        shard_size_chunks=2
                    ),
                    aqz.Dimension(
                        name="x",
                        kind=aqz.DimensionType.SPACE,
                        array_size_px=512,
                        chunk_size_px=256,
                        shard_size_chunks=2
                    )
                ]
            )
        )
    ]
)

# Configure the plate
plate = aqz.Plate(
    path="experiment_plate",
    name="My HCS Experiment",
    row_names=["A", "B", "C", "D", "E", "F", "G", "H"],
    column_names=["1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12"],
    wells=[well_a1],  # Add more wells as needed
    acquisitions=[acquisition]
)

# Create stream with HCS configuration
settings = aqz.StreamSettings(
    store_path="hcs_experiment.zarr",
    overwrite=True,
    hcs_plates=[plate]
)

stream = aqz.ZarrStream(settings)

# Write data to specific field of view
frame_data = np.random.randint(0, 2**16, (3, 512, 512), dtype=np.uint16)
stream.append(frame_data, key="experiment_plate/A/1/fov1")

# Close when done
stream.close()

You can also combine HCS plates with flat arrays in the same dataset:

# Add a labels array alongside HCS data
labels_array = aqz.ArraySettings(
    output_key="experiment_plate/A/1/labels",
    data_type=np.uint8,
    dimensions=[
        aqz.Dimension(
            name="y",
            kind=aqz.DimensionType.SPACE,
            array_size_px=512,
            chunk_size_px=256,
            shard_size_chunks=2
        ),
        aqz.Dimension(
            name="x",
            kind=aqz.DimensionType.SPACE,
            array_size_px=512,
            chunk_size_px=256,
            shard_size_chunks=2
        )
    ]
)

settings = aqz.StreamSettings(
    store_path="mixed_experiment.zarr",
    overwrite=True,
    arrays=[labels_array],  # Flat arrays
    hcs_plates=[plate]      # HCS structure
)

stream = aqz.ZarrStream(settings)

# Write to both HCS and flat arrays
stream.append(frame_data, key="experiment_plate/A/1/fov1")
labels_data = np.zeros((512, 512), dtype=np.uint8)
stream.append(labels_data, key="experiment_plate/A/1/labels")

stream.close()

In C, the equivalent HCS workflow would look like this:

#include "acquire.zarr.h"

// Create array settings for field of view
ZarrArraySettings fov_array = {
    .data_type = ZarrDataType_uint16,
};

ZarrArraySettings_create_dimension_array(&fov_array, 4);
fov_array.dimensions[0] = (ZarrDimensionProperties){
    .name = "t",
    .type = ZarrDimensionType_Time,
    .array_size_px = 0,
    .chunk_size_px = 10,
    .shard_size_chunks = 1,
};
fov_array.dimensions[1] = (ZarrDimensionProperties){
    .name = "c", 
    .type = ZarrDimensionType_Channel,
    .array_size_px = 3,
    .chunk_size_px = 1,
    .shard_size_chunks = 1,
};
fov_array.dimensions[2] = (ZarrDimensionProperties){
    .name = "y",
    .type = ZarrDimensionType_Space,
    .array_size_px = 512,
    .chunk_size_px = 256,
    .shard_size_chunks = 2,
};
fov_array.dimensions[3] = (ZarrDimensionProperties){
    .name = "x",
    .type = ZarrDimensionType_Space,
    .array_size_px = 512,
    .chunk_size_px = 256,
    .shard_size_chunks = 2,
};

// Create well with field of view
ZarrHCSWell well = {
    .row_name = "A",
    .column_name = "1",
};

ZarrHCSWell_create_image_array(&well, 1);
well.images[0] = (ZarrHCSFieldOfView){
    .path = "fov1", // Relative to well: plate/A/1/fov1
    .acquisition_id = 0,
    .has_acquisition_id = true,
    .array_settings = &fov_array,
};

// Create plate
ZarrHCSPlate plate = {
    .path = "experiment_plate",
    .name = "My HCS Experiment",
};

// Set up row and column names
ZarrHCSPlate_create_row_name_array(&plate, 8);
const char* row_names[] = {"A", "B", "C", "D", "E", "F", "G", "H"};
for (int i = 0; i < 8; i++) {
    plate.row_names[i] = row_names[i];
}

ZarrHCSPlate_create_column_name_array(&plate, 12);
const char* col_names[] = {"1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12"};
for (int i = 0; i < 12; i++) {
    plate.column_names[i] = col_names[i];
}

// Add wells and acquisitions
ZarrHCSPlate_create_well_array(&plate, 1);
plate.wells[0] = well;

ZarrHCSPlate_create_acquisition_array(&plate, 1);
plate.acquisitions[0] = (ZarrHCSAcquisition){
    .id = 0,
    .name = "Measurement_01",
    .start_time = 1343731272000,
    .has_start_time = true,
    .end_time = 1343737645000,
    .has_end_time = true,
};

// Create HCS settings
ZarrHCSSettings hcs_settings = {
    .plates = &plate,
    .plate_count = 1,
};

// Configure stream
ZarrStreamSettings settings = {
    .store_path = "hcs_experiment.zarr",
    .overwrite = true,
    .arrays = NULL,
    .array_count = 0,
    .hcs_settings = &hcs_settings,
};

ZarrStream* stream = ZarrStream_create(&settings);

// Write data
uint16_t* frame_data = /* your image data */;
size_t frame_size = 3 * 512 * 512 * sizeof(uint16_t);
size_t bytes_written;

ZarrStream_append(stream, frame_data, frame_size, &bytes_written, "experiment_plate/A/1/fov1");

// Cleanup
ZarrStream_destroy(stream);
ZarrHCSPlate_destroy_well_array(&plate);
ZarrArraySettings_destroy_dimension_array(&fov_array);

The resulting dataset will include proper OME-NGFF metadata for plates and wells.

S3

The library supports writing directly to S3-compatible storage. We authenticate with S3 through environment variables or an AWS credentials file. If you are using environment variables, set the following:

AWS_ACCESS_KEY_ID: Your AWS access key
AWS_SECRET_ACCESS_KEY: Your AWS secret key
AWS_SESSION_TOKEN: Optional session token for temporary credentials

These must be set in the environment where your application runs.

Important Note: You should ensure these environment variables are set before running your application or importing the library or Python module. They will not be available if set after the library is loaded. Configuration requires specifying the endpoint, bucket name, and region:

// ensure your environment is set up for S3 access before running your program
#include <acquire.zarr.h>

ZarrStreamSettings settings = { /* ... */ };

// Configure S3 storage
ZarrS3Settings s3_settings = {
    .endpoint = "https://s3.amazonaws.com",
    .bucket_name = "my-zarr-data",
    .region = "us-east-1"
};

settings.s3_settings = &s3_settings;

In Python, S3 configuration looks like:

# ensure your environment is set up for S3 access before importing acquire_zarr
import acquire_zarr as aqz

settings = aqz.StreamSettings()
# ...

# Configure S3 storage
s3_settings = aqz.S3Settings(
    endpoint="s3.amazonaws.com",
    bucket_name="my-zarr-data",
    region="us-east-1"
)

# Apply S3 settings to your stream configuration
settings.s3 = s3_settings

Threading

The stream's thread pool size is controlled by max_threads (ZarrStreamSettings.max_threads in C/C++, StreamSettings.max_threads in Python). Leaving it at its default of 0 means "not explicitly set": the stream will use the ZARR_MAX_THREADS environment variable if it's set to a positive integer, or otherwise auto-detect based on hardware concurrency.

ZARR_MAX_THREADS is ignored if max_threads is explicitly set to a nonzero value.
An invalid ZARR_MAX_THREADS value (non-numeric, zero, or negative) is ignored, with a warning logged, and auto-detection is used instead.

Anaconda GLIBCXX issue

If you encounter the error GLIBCXX_3.4.30 not found when working with the library in Python, it may be due to a mismatch between the version of libstdc++ that ships with Anaconda and the one used by acquire-zarr. This usually manifests like so:

ImportError: /home/eggbert/anaconda3/envs/myenv/lib/python3.10/site-packages/acquire_zarr/../../../lib/libstdc++.so.6: version `GLIBCXX_3.4.30` not found (required by /home/eggbert/anaconda3/envs/myenv/lib/python3.10/site-packages/acquire_zarr/../../../lib/libacquire_zarr.so)

To resolve this, you can install the libstdcxx-ng package from conda-forge:

conda install -c conda-forge libstdcxx-ng

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acquire-zarr 0.9.0

Acquire Zarr streaming library

Installing

Precompiled binaries

Python

Local Development Quickstart

Docker

Building

Installing dependencies

Configuring

Building

Installing for Python

Usage

Understanding the output hierarchy

Organizing data within a Zarr container

Writing custom metadata

High-content screening workflows

S3

Threading

Anaconda GLIBCXX issue

Key dates

Owner

2 maintainers

Credits

Requires

Provides Extra

Download files

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