Add Measurement Points to Thermal Images
Took a photo with your phone thermal camera and want to add measurement points afterward? Open a JPG shot with the Mileseey app (such as the Mileseey TR256) or an original FLIR thermal JPG and the tool reads the raw temperature data hidden in the photo and shows the temperature (°C) wherever you click. Free, no install or sign-up, and your photo is never sent to a server.
How to use
- Select an original thermal JPG taken with the Mileseey app (com.dyt.wcc.milesee) or a FLIR camera, or drop it onto the area above. The Mileseey app saves photos in the DCIM/DYTCamera folder of your phone.
- The temperature data inside the photo is shown as a color image, from dark purple (cooler) through orange and yellow (hotter).
- Click the spot you want to measure and a point appears with its temperature in °C.
- Press and hold a point to bring up a magnifier so you can see the area under your finger, and drag to move it.
- FLIR photos open as a composite of the visible and thermal images, and the [Thermal blend] slider sets how much of each you see. [Save composite image] saves the composite and [Save thermal only] saves just the thermal image, both with the measurement points and temperatures, as a JPG file. Photos without a visible image (such as Mileseey) use [Save as image] to save the thermal image.
- Tap an existing point to remove it, or use [Undo last point] to remove only the most recent one, or [Clear all points] to remove them all at once.
Features
- The magnifier that appears while you press shows each temperature pixel and its value, so you can place a point precisely.
- The image is painted directly from the raw temperature values stored in the photo, so the picture and the numbers always agree.
- Points are stored in temperature-data coordinates, so they stay exactly in place even if the screen size changes.
- A regular JPG with no temperature data gets a clear error message.
- Everything is calculated inside your browser and your photo is never sent anywhere.
Supported phone thermal cameras
JPG files taken with the Mileseey app (com.dyt.wcc.milesee), such as the Mileseey TR256, and original FLIR radiometric JPG files (checked with a FLIR E6xt) can be opened. Other phone thermal cameras such as the Seek Thermal and TC01A store their temperature data in a different format, so this tool cannot read their temperatures at the moment. For photos from those cameras, you can lay them over a regular photo with the Thermal + Visible Image Overlay.
FAQ
Can I add measurement points to a thermal photo after taking it?
Yes. Open the thermal JPG on this page and click the spot you want to measure. A measurement point appears there with its temperature. You do not need to set any points while shooting.
Can I save the thermal photo with my measurement points?
Yes. After adding points, press the save button to download an image with the points and their temperatures (°C) drawn on it as a JPG file. For FLIR photos you can choose between the composite of the visible and thermal images, or the thermal image only. Saving happens entirely in your browser and your photo is never sent anywhere.
Which photos can I open?
JPG files taken with the Mileseey thermal camera app (such as the Mileseey TR256) and original JPG files from FLIR thermal cameras. Photos whose temperature data was removed (for example, sent through a messenger app) and regular photos cannot be opened.
Does it work with FLIR One, Seek Thermal or TC01A photos?
FLIR radiometric JPG files open here (checked with a FLIR E6xt; other FLIR models that use the same format should work too). Seek Thermal and TC01A photos use a different temperature data format and will not open here at the moment, but you can lay them over a regular photo with the Thermal + Visible Image Overlay tool.
How is the temperature calculated?
The raw value stored in the photo is in units of 1/64 kelvin, and it is converted to Celsius with "value ÷ 64 − 273.15". We checked the results against the maximum, minimum and center temperatures shown in the app and they match. For FLIR photos, the calibration values stored in the photo (emissivity, distance, humidity and so on) are used in the calculation.
Is my photo uploaded to a server?
No. Everything is calculated inside your browser and the photo is never sent anywhere.
Why do the colors look different from photo to photo?
The colors are scaled from the coolest to the hottest temperature in each photo, so they differ between photos. Read the exact temperature from the number at the measurement point, not from the color.