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Manual for Thermal Camera (Android)

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Every feature marked with a (+) is only available in the plus version of this app.

Main Screen

Photo Button

This button takes an image. The app will automatically take three types of images by default:

  • (+) Thermal Image I (with additional informations)
  • Thermal Image II (without additional informations and cropped, can be edited in Flir Tools)
  • (+) Real Color Image
Thermal Image I
Thermal Image II
Real Color Image

You can toggle each image individualy inside the Options below "Images to save"

By default the images are saved into a subfolder called Thermal Camera inside the media folder of android. As long as Flir Tools is installed it's also possible to save them into the default folder of Flir Tools. This can help accessing the Thermal Image II faster.

Super Resolution (+)

This button toggles Super Resolution (SR). That's a mode where an intelligent overlay of previous frames removes non static noise and makes more details visible.

It works best when the phone is held still. The button will turn red if there's to much camera movement and only the last frame is shown. A green button means the algorithm has improved the image and is ready to save it.

You can also select how much sharpening is applied in the settings under Sharpening Mode. You can select between two modes:

  1. Hard:
  2. Soft:
You'll see more details, but loose the thermal precision
You'll see less details, but the color represents the actual temperature betters

Without SR
With SR and soft sharpening

Currently Super Resolution is only available for images that are saved as the Thermal Image I type.

Neutral-density filter

A neutral density filter will reduce the energy that reaches the lepton sensor. That means that using a neutral-density filter will allow you to take an image of a scene that would be to hot for the Flir One to measure.

To transform the measured temperature T1, viewed through an ND filter with τ, into the actual temperature T the app uses the formula:
T = T1 / τ^0.25

τ can be changed in the Options.

The Thermal Image II doesn't save the τ value. If you open it in Flir Tools for desktop you must separately specify the τ value of you neutral-density filter.

Min / Max Temperature

These two numbers always represent the min / max temperature of the current palette. They can trigger two different actions:

  • (+) Short tap: toggle Min / Max Indicators
  • (+) Long press: open dialog to change lower and upper bounds of palette

Temperature Bounds Dialog

Currently the upper and lower temperature bounds are only saved with the Thermal Image I image format.

Min / Max Indicators (+)

The triangles on the screen show the position of the minimum and maximum temperature on the thermal image. As long as the scale isn't locked in any way the minimum and maximum temperatures are simultaneously indicated on the scale.

Toggle display of the indicators by tapping the displayed minimum/ maximum temperature near the palette.

The triangles are only visible in the Thermal Image I format.


The palette defines how the thermal image is colorized. There are currently twelve different palettes available:

Palette Palette used for Thermal Image II Cold - Color - Hot
Arctic Arctic
Iron Iron
Iron Gray Iron
Lava Lava
Black/ White Gray
Inverted Gray Gray
Rainbow Rainbow
Double Rainbow Rainbow
Rain Rain (Contrast)
Color Wheel 12 Colors Color Wheel 6 Colors (Wheel)
Color Wheel 6 Colors Color Wheel 6 Colors (Wheel)
Color Wheel Redhot Color Wheel 6 Colors (Wheel)

Most palettes don't have a representation in the Flir Framework and are not saved with the Thermal Image II. There the app chooses a palette that's very similar to the selected one. See the second column in the above table.

You can also change the upper and lower bounds of the palette. Either by locking the palette or by setting them manually. It should be mentioned that the Flir One has huge temperature jumps (<2 K) before and after tuning.

You can also change the gamma value of the palette by sliding up and down on the screen. For more information see the Gestures Section.

Little Settings

This menu contains shortcuts to some relevant settings that are needed to use the app. It can be opened by tapping on the Little Settings Status Button.

The menu contains from left to right following settings:

Palette Chooser

This button opens a dialog with which you can switch between different palettes.

Unit Selector

The Unit Selector has two different actions:

  • Short Tap: switch between the favorite units previously selected in the Options.
  • Long Press: opens a dialog that let you choose between all available units in the app. The settings will be dismissed if the button is tapped again.

Palette Locker

A simple tap will lock / unlock the Palette.

Tuning Button

This button also has two different actions available:

  • Short Tap: tunes the camera
  • (+) Long Press: switches between automatic or manual only tuning mode

By default the camera will tune itself automatically. But the thermal image will be in average by about 1K hotter afterwards. If you want comparable temperature values between two images the manual mode should fit best your needs. For more information see this post in the EEVBlog

MSX Toggle

This button will switch between MSX and the image algorithm of this app. Because MSX is rendered by the Flir Framework most of the features mentioned above will not be shown there. In fact what is visible here is the Thermal Image II.

(+) Toggle ND Filter

This will toggle the algorithms for the Neutral Density Filter on and off.

Little Settings Status

This button opens the Little Settings menu. It also contains some status informations like:

  • Palette locked/ unlocked

Cross Hair

You can use the Cross Hair to find the temperature of an element on the thermal image. The cursor can simply be drag'n dropped around the screen and the temperature behind it is displayed on the bottom, left to the real color image (See title image). You can reset the cursor by double tapping on it.

The cursor can also be hidden by tapping the cross hair icon on the right of the temperature. If done so the cursor will also be not saved when taking a photo.

Saved image without crosshair
and with crosshair enabled


Favorite units

Here you can change your favorite units that you prefer to most. In the thermal view you can switch easily between them with the Unit Selector in the Little Settings Menu.

Option Dialog

Save in Flir Tools Folder

If on and Flir Tools is installed the image is being saved in the Flir Tools folder. The subtitle of setting shows the location of the folder.

Images to save (+)

In this tap you can toggle each image format, that will be saved, individualy.

By default the Flir Tools compatible image is disabled.

Show battery value in %

This setting toggles if the battery status should be shown just as an image or additionally with the charging state in percent.

Sharpening mode (+)

Modes are:

  • Medium
  • Harder

See Super Resolution for more information.

Nearest Neighbor Zooming (+)

Normally the displayed image is scaled with a bilinear scaling. If you want to see the single pixels, Nearest Neighbor Zooming is the way to go.

This is only available for Thermal Image I.

Standard image rotation

If the USB port of the phone is not at the bottom, the image can be rotated to display the correct orientation.

Hide real color image (+)

The real color image that represent the visible light spectrum can be very useful. But if the layout compresses everything too much, hiding this image makes more space available on the bottom bar.

When the visible image is toggled of, it will still be saved with all the other images.

Show Connect FLIR One screen (+)

If deactivated the app will directly start into the display without showing the "Connect Flir One" screen.


This value is important to calculate the right temperature for the viewed object. For more information about it see: Wikipedia.

Reflected Apparent Temperature

This value represent the ambient temperature that's reflected by the viewed object.

Object distance

This value is currently not implemented.

Activate ND filter (+)

Only if switched on the GUI elements for the Neutral Density Filter will appear on the screen.

Transmission of ND Filter (+)

This setting is the τ value of the used ND filter. For more information please see the ND Filter Section


Action Function
swipe up or down
  • Changes the gamma value of the palette (outside MSX)
  • Changes the MSX distance (+, inside MSX)
double tap Resets those properties to their original values:
  • Gamma value (outside MSX)
  • MSX distance (inside MSX)
  • Cross Hair
©2016 - Georg A. Friedrich