This is the official software for Fluke camera users. It is designed to "view, optimize, and analyze" infrared images and is the most reliable way to export to JPG.
Here are the most reliable ways to convert your IS2 files to JPG format. is2 file to jpg converter
Help you find a since many of these tools are Windows-only. This is the official software for Fluke camera users
claim to open or convert IS2 files to PDF, which you could then save as an image, though this may lose important thermal metadata. is2 file to jpg converter
Data Integrity: You will lose the ability to change temperature scales once the file is a JPG. Why JPG is Better for Sharing