JS9: astronomical image display everywhere | |||||
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JS9 brings astronomical image display to your browser and desktop:
Drag and drop a FITS astronomical data file onto the display and JS9 functionality immediately becomes available: zoom, pan, colormaps, scaling, regions, WCS, image filters, smoothing ... By extending JS9 with the plugin facility and the public API, you can perform local analysis on the displayed image: click the Plugins tab, create a region, move it around ... Images loaded on the server, loaded via proxy (File menu), or uploaded (Analysis menu) all support server-side analysis. Results are displayed in your browser: click the Analysis tab, choose a task, create a region, move it around ... Want a pristine JS9 display?
Energy Spectrum
Counts in Regions
Radial Profile
Light Curve
JS9 can be connected to a
server-side (back-end) analysis system to run complex
analysis tasks. Text and plot results can be displayed on
the JS9 web page, or new images loaded into JS9. Virtually
any analysis program can be added to the back-end.
Here is a quick introduction to server-side analysis using regions:
Extend JS9 with
Plugins,
using the
JS9 Public API
to perform event-driven, local analysis. Create a region, move it around ...
JS9 Help Pages:
web page configuration:
Recent Public Releases:
Release 3.8 (06/21/22) Eric's final release Release 3.7 (05/16/22) Eric's penultimate release Patch Release 3.6.2 (01/03/22) add experimental support for converting event tables to 3D cubes Patch Release 3.6.1 (08/16/21) two bug fixes Release 3.6 (07/30/21) improvements to regions, including graphical editing of annuli Release 3.5 (06/01/21) remove long-deprecated fits2png support and improve display of png/jpeg files Release 3.4 (05/05/21) lots of work on regions, including non-transient groups and boolean selections Release 3.3 (12/14/20) update three important modules (emscripten, socket.io, fabric.js), along with a few bug fixes Release 3.2 (11/06/20) mainly changes to support the upcoming desktop Voyager app, but also a few bug fixes For more details, see the ChangeLog. JS9 is distributed under the terms of The MIT License.
The JS9 current release tar file is available here:
Simply untar to display FITS images with all basic JS9 functionality.
Install JS9
to add functionality, such as server-side analysis.
To run the demo pages, download the data tar file here: The latest bug fixes and enhancements are available on GitHub: Clone JS9 from GitHub once and then pull updates at any time:git clone https://github.com/ericmandel/js9 git pull For Mac (Catalina) and Linux (Ubuntu 20.04) users, pre-built desktop apps are available: Pre-built apps lack some configurability, but their ease of installation and use will make most users happy.In addition, the pyjs9 Python interface is available on GitHub: It supports communication with JS9 using the public API.
We gratefully acknowledge the technologies that power JS9:
With important suggestions (and sometimes code) from:
Funded by Smithsonian Institution, the Chandra X-ray Science Center (NAS8-03060), and NASA's Universe of Learning (STScI-509913).
Source code @GitHub
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