R-JPEG converter for DJI thermal images

What an R-JPEG is

An R-JPEG, also written RJPEG, is a JPEG that carries the raw thermal measurements as well as a picture. DJI thermal drones such as the Zenmuse H30T and H20T and the Matrice 30T, Mavic 3T and Matrice 4T save images this way. The picture you see is a colour rendering. The temperatures are in a block of data that only DJI's own software understands.

Why other thermal software shows a plain picture

FLIR software looks for FLIR's radiometric data block in the file. A DJI R-JPEG has DJI's block instead, so FLIR Thermal Studio opens it as an ordinary JPEG, with no temperature on hover and no measurement tools.

What ThermaBridge does

1. Reads the temperature of every pixel from your DJI file, using the measurement settings stored in the image: emissivity, distance, humidity, atmospheric and reflected temperature.
2. Writes those temperatures into a FLIR radiometric block, with the settings alongside, so FLIR Thermal Studio reads them as it would an image from a FLIR camera.
3. Keeps the GPS position, and embeds the zoom (or wide) photo as the visible picture, aligned to the thermal view.
4. Applies the palette, colour distribution and temperature span you choose.

What to know before you rely on it

• Accuracy is that of the DJI camera that took the image, typically within about 2 °C or 2%. Converting does not improve it.
• Use the original files from the drone. Copies that were resized, edited, or sent through apps that strip metadata lose the thermal data.
• Tested on Zenmuse H30T images. See supported drones for the other models.