napari 0.3.8

We’re happy to announce the release of napari 0.3.8! napari is a fast, interactive, multi-dimensional image viewer for Python. It’s designed for browsing, annotating, and analyzing large multi-dimensional images. It’s built on top of Qt (for the GUI), vispy (for performant GPU-based rendering), and the scientific Python stack (numpy, scipy).

For more information, examples, and documentation, please visit our website:


This release is mainly a bug fix release, with a number of small improvements including around our contrast limits updates (#1622) and points coloring (#1641) and (#1643). This will also be our last release supporting Python3.6.


  • Async-2.5: Vispy Changes (#1607)

  • Increase screenshot performance (#1615)

  • Speed up points selection and selection display (#1648)

Bug Fixes

  • Remove silence overwritte during screenshot (#1567)

  • Fix usage nan_to_num to work with numpy 1.16 (#1613)

  • Update colortransform when building texture (#1622)

  • Fix points layer coloring (#1623)

  • Fix painting by creating a new slice every time (#1641)

  • Fix new color point off (#1643)

  • Prevent bundle fail when name is not napari (#1647)

Build Tools and Docs

  • Add test matrix entry to test minimum requirements (#1617)

  • Change bundle deps approach (#1619)

  • Use pyside2-rcc if pyrcc5 fail (#1626)

  • Big update of rendering explanation doc (#1632)

  • Do not ship in source distribution (#1633)

  • Remove Python version requirement for pre-commit (#1645)

  • Add github retry action to try and fix flaky app bundling (#1649)

6 authors added to this release (alphabetical)

5 reviewers added to this release (alphabetical)