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Thermalyze software uses Planck’s blackbody equation to calculate the corrected temperature (Tobj) from the measured apparent temperature (Tapp). For example, if region emissivity is set to 0.80, this indicates to Thermalyze that 20% of the emittance associated with Tobj is missing, substituted with 20% of the emittance associated with ambient temperature (Tamb).
The temperate difference related to this missing emittance must then be added to Tapp in order to calculate Tobj. Using a simplified linear approximation to Planck's blackbody equation (only to clarify the concept), the added temperature is equal to 0.20 x (Tobj - Tamb).
If the ambient temperature is close to the object temperature (for example, both close to 30°C), then (Tobj – Tamb) will be equal to zero and thus Tapp does not change when emissivity is changed.