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napari/OMERO interoperability

Project description


License Version Python Version CI

This package provides interoperability between the OMERO image management platform, and napari: a fast, multi-dimensional image viewer for python.

It provides a GUI interface for browsing an OMERO instance from within napari, as well as command line interface extensions for both OMERO and napari CLIs.



  • GUI interface to browse remote OMERO data, with thumbnail previews.
  • Loads remote nD images from an OMERO server into napari
  • Planes are loading on demand as sliders are moved ("lazy loading").
  • session management (login memory)
  • OMERO rendering settings (contrast limits, colormaps, active channels, current Z/T position) are applied in napari

as a napari dock widget

To launch napari with the OMERO browser added, install this package and run:


The OMERO browser widget can also be manually added to the napari viewer:

import napari
from napari_omero import OMEROWidget

with napari.gui_qt():
    viewer = napari.Viewer()
    viewer.window.add_dock_widget(OMEROWidget(), area="right")

as a napari plugin

This package provides a napari reader plugin that accepts OMERO resources as "proxy strings" (e.g. Image:<ID>) or as OMERO webclient URLS.

viewer = napari.Viewer()

# omero object identifier string"Image:1", plugin="omero")

# or URLS:"")

these will also work on the napari command line interface, e.g.:

napari Image:1
# or

as an OMERO CLI plugin

This package also serves as a plugin to the OMERO CLI

omero napari view Image:1
  • ROIs created in napari can be saved back to OMERO via a "Save ROIs" button.
  • napari viewer console has BlitzGateway 'conn' and 'omero_image' in context.


Requires python 3.7 - 3.9.

It's easiest to install omero-py from conda, so the recommended install procedure is to first create a new conda environment (here called "omero") with omero-py installed from the ome channel, and then use pip to install napari-omero (until we have a conda package available).

conda create -n omero -c ome python=3.7 omero-py
conda activate omero
pip install napari-omero


This is alpha software & some things will be broken or sub-optimal!
  • experimental & definitely still buggy! Bug reports are welcome!
  • remote loading can be very slow still... though this is not strictly an issue of this plugin. Datasets are wrapped as delayed dask stacks, and remote data fetching time can be significant. Plans for asynchronous rendering in napari and tiled loading from OMERO may eventually improve the subjective performance... but remote data loading will likely always be a limitation here.


Contributions are welcome! To get setup with a development environment:

# clone this repo:
git clone
# change into the new directory
cd napari-omero
# create conda environment
conda env create -f environment.yml
# activate the new env
conda activate napari-omero

To maintain good code quality, this repo uses flake8, mypy, and black. To enforce code quality when you commit code, you can install pre-commit

# install pre-commit which will run code checks prior to commits
pre-commit install

The original OMERO data loader and CLI extension was created by Will Moore.

The napari reader plugin and GUI browser was created by Talley Lambert

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