A Python library for reading and analyzing Fluke thermal imaging files in .is2 format.

Package: fluke-thermal-reader · Import: import fluke_thermal_reader or from fluke_thermal_reader import read_is2

• .is2 reading: Full parsing of Fluke thermal imaging files (.is2)
• Temperature conversion: Raw counts to temperature (°C) with emissivity and reflected background correction (radiative formula)
• Metadata: Camera model, dimensions, emissivity, transmission, background temperature, min/max/avg from file and from JSON when present
• Minimal dependencies: Only numpy
• Tested and working: Fluke Ti480P and Ti300

pip install fluke-thermal-reader

From the repository root:

pip install -e .

Or in non-editable mode:

pip install .

from fluke_thermal_reader import read_is2

# Load a .is2 file
data = read_is2("thermal_image.is2")

# Thermal matrix (2D, °C)
thermal_data = data["data"]
print(f"Temperature range: {thermal_data.min():.1f}°C - {thermal_data.max():.1f}°C")

# Metadata
print(f"Camera: {data['CameraModel']}")
print(f"Size: {data['size']}")  # [width, height]
print(f"Emissivity: {data['Emissivity']}")
print(f"Background temperature: {data['BackgroundTemp']}°C")

import matplotlib.pyplot as plt
from fluke_thermal_reader import read_is2

data = read_is2("thermal_image.is2")
plt.imshow(data["data"], cmap="coolwarm", aspect="equal")
plt.colorbar(label="Temperature (°C)")
plt.title(f"Thermal image — {data['CameraModel']}")
plt.show()

• Python 3.8+
• numpy >= 1.20.0

For visualization: matplotlib (optional).

Tested and working with:

• Fluke Ti480P
• Fluke Ti300

Other Fluke .is2 files may work; feedback and sample files for additional models are welcome.

Fluke_Python/
├── fluke_thermal_reader/    # Main package
│   ├── __init__.py
│   ├── reader.py            # read_is2, FlukeReader
│   ├── parsers.py           # IS2 parser
│   ├── utilities.py         # UnitConversion, calc_equation
│   ├── models.py
│   └── cli.py
├── examples/                 # Usage examples
├── tests/                    # Tests
├── pyproject.toml
├── requirements.txt
└── README.md

# Editable install
pip install -e ".[dev]"

# Run tests
pytest

read_is3(file_path) is planned for Fluke IS3 (video) files.

• Current status: Not implemented — calling it raises NotImplementedError.
• Scope: Video streams (multiple thermal frames), video-level metadata.
• Documentation: The returned data structure will be defined once implementation starts.

If you are interested in IS3 support, please open an issue with sample files and requirements.

See the LICENSE file in the repository.

• Stable .is2 parser with temperature conversion (emissivity + background temperature)

• Initial release, basic .is2 support