For the majority of infrared cameras, what 3 critical parameters cannot be changed once an image is saved in digital format?

• A. Emissivity, reflected temperature
• B. Focus, range, distance
• C. Resolution, frame rate, color
• D. Field of view, brightness, contrast

Answer: (B)

The key idea is that some aspects of an infrared image are set at the moment of capture and can’t be altered just by editing the saved file. Focus, range, and distance are determined by the optics and the scene arrangement during capture, so the sharpness, the perceived depth, and the actual geometry of the target are baked into the image data. After saving, you can’t rework the file to change where the lens was focused or how far away the subjects were without recapturing or reconstructing from different data.

By contrast, many other attributes can be adjusted post‑capture. Emissivity and reflected temperature can be recalibrated or reinterpreted in software if you use different assumptions about the scene. Resolution, frame rate, and color mapping can be changed through resampling or applying different palettes. Brightness and contrast can be modified, and you can crop to alter the apparent field of view.