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Apps / Blackbody

Blackbody

Inspect thermograms

Arthur Nieuwland ✓ Verified

eu.nimmerfort.blackbody
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Blackbody is a viewer for FLIR, Fluke, HTI, and IRG thermograms and other thermal images. Explore temperatures under the cursor, render to different palettes and ranges, overlay the visible-light photo, and inspect embedded measurements and camera metadata.

Blackbody reads thermograms from many FLIR cameras, including the visible-light photo, and also opens Fluke thermograms from cameras such as the Ti400, Ti401p, TiS75+, and Ti25, HTI / ToolTop thermograms, and IRG thermograms such as the Topdon TC004. Plain thermal data can be imported and exported as single-band TIFFs or 16-bit PNGs.

Features:

  • Inspect the temperature under the cursor, in celsius, fahrenheit, or kelvin
  • View embedded measurements: spots, lines, and areas
  • Overlay view (Picture-in-Picture or MSX) combining thermal and visible images
  • Render to the camera's embedded palette or many built-in ones, including inferno and turbo
  • Adjust the temperature range to make details stand out
  • Metadata panel with camera info and GPS location, openable in a map
  • Export renders to PNG and thermal data to TIFF or 16-bit PNG
  • Zoom, pan, and browse through a folder of thermograms
  • Translated to multiple languages
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Screenshots

Inspect thermograms rendered with the palette embedded by the camera
Inspect thermograms rendered with the palette embedded by the camera
View measurements drawn directly on the render and in a side-pane
View measurements drawn directly on the render and in a side-pane
The info panel shows camera details and metadata for every thermogram
The info panel shows camera details and metadata for every thermogram
Spot measurements on a thermogram in fahrenheit with a custom palette
Spot measurements on a thermogram in fahrenheit with a custom palette
Overlay view blends the thermal image with the visible-light photo
Overlay view blends the thermal image with the visible-light photo
Zoom in and narrow the temperature range to make the details stand out
Zoom in and narrow the temperature range to make the details stand out
Cold air leaking in under a door, captured with a Fluke is2
Cold air leaking in under a door, captured with a Fluke is2

Observed history

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Upstream releases

Release notes supplied by the developer. These dates are not Flathub package publication times.

2.3.029 Aug 2026

This release adds support for more thermogram formats and brings Picture-in-Picture to Fluke cameras:

  • Thermograms from DJI drones with a FLIR Tau camera (Zenmuse XT, XTR, and some XT2 files) now open; they used to fail to load
  • HTI / ToolTop files now open, including their metadata and the camera's three built-in spot measurements
  • IRG thermograms (e.g. Topdon TC004) now open, including the visible-light photo
  • Picture-in-Picture (Overlay) now works for Fluke thermograms (Ti400, Ti401p, TiS75+)
  • Fixed some FLIR visible-light photos (e.g. E40) decoding with a green-magenta color cast
  • Fixed a bug that could drop some embedded measurements
2.2.013 Aug 2026

Blackbody now opens Fluke thermograms! This release adds support for is2 files, both older binary and newer zip-style, from cameras such as the Ti400, Ti401p, TiS75+, and Ti25 — including the visible-light photo, embedded measurements, capture parameters, and the camera's palette. Other improvements:

  • FLIR (and Fluke!) thermograms open in the render range embedded by the camera
  • A more natural double-ended temperature range slider
  • The info panel is available for all file formats, and panels recover gracefully when a file fails to load
  • Blackbody can now open files from a file manager's "Open with" menu for JPEG, PNG, and TIFF files, including from within the Flatpak sandbox
  • Improved keywords and categories make Blackbody easier to find
2.1.020 Jul 2026

An incremental release improving how you browse and navigate thermograms:

  • Added "Open folder…" (Ctrl+Shift+O) to browse a whole directory with the keyboard, working within the Flatpak sandbox via the file chooser portal
  • Reduced Flatpak permissions: file access is now granted per file/folder via the portal instead of static filesystem access
  • On-screen previous/next arrows appear when the directory has more thermograms to browse through
  • Pressing a navigation key when only the open file is accessible shows a hint with a shortcut to open the folder instead
  • The image can be dragged to pan when it is larger than the window
2.0.018 Jul 2026

A major release porting Blackbody to GTK4 and libadwaita, with a redesigned interface and many new features:

  • Completely redesigned user interface, dark by default, with on-screen temperature range sliders
  • Overlay view (Picture-in-Picture or MSX) next to the thermal and visible spectrum views
  • Embedded measurements (spots, lines, and areas) are now drawn on the render
  • Temperatures can be shown in celsius, fahrenheit, or kelvin
  • Information panel showing camera metadata and GPS location, with the option to open the location in a map
  • Support for loading 16-bit centikelvin PNGs
  • Scroll to zoom and keyboard navigation through all thermograms in a directory
  • Palette choice is remembered when opening the next thermogram
  • Improved export options and clearer error messages
  • More supported FLIR cameras due to upgrading to flyr==0.7.0