Skip to main content

Visualize 3D numpy arrays in the browser.

Project description

PyPI version


Multiplatform 3D numpy image browser based viewer.

from microviewer import view, hyperview

view(numpy_image) # for gray and color images
view(numpy_image, seg=True) # for segmentation labels
view(numpy_image, seg=True, port=8082)

hyperview(image, labels) # interactive overlay
uview image.npy.gz # view as image
uview labels.npy.gz --seg # view as segmentation
uview image.npy.gz labels.npy.gz # view image w/ overlay
uview image.npy.gz --paint # view image w/ blank overlay

Segmentation display in microviewer

Visualize 3D numpy arrays in your browser without difficult installation procedures or reformatting your data. The code is CPU based and the image is uncompressed in memory. You're limited to images that are at most 2^31 bytes large (~2.1 GB) due to browser limitations.


  • 3 axis visualization of 3D images.
  • Grayscale images with segmentation overlay.
  • Segmentation selection with brush tools.
  • Direct voxel painting.
  • Save segmentation as .npy or .ckl, an advanced compresssion format.
  • Undo/Redo


  • 8-bit grayscale 3D images
  • color images (including 3 channel 3D images)
  • floating point images
  • boolean images
  • segmentation labels
  • .npy, .ckl, or .nii format

For .ckl and .nii formats, you must separately install crackle-codec and nibabel respectively.


pip install "microviewer[all_formats]"

all_formats will install all supported formats for the CLI. By default, only .npy filesare supported.


This microviewer package has been a part of CloudVolume since 2018, but is now broken out into its own package for more flexible wider use. Microviewer uses a modified version of (2016) to represent the array in Javascript, which was originally developed for

Project details

Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Source Distribution

microviewer-1.7.1.tar.gz (1.4 MB view hashes)

Uploaded Source

Built Distribution

microviewer-1.7.1-py3-none-any.whl (147.6 kB view hashes)

Uploaded Python 3

Supported by

AWS AWS Cloud computing and Security Sponsor Datadog Datadog Monitoring Fastly Fastly CDN Google Google Download Analytics Microsoft Microsoft PSF Sponsor Pingdom Pingdom Monitoring Sentry Sentry Error logging StatusPage StatusPage Status page