Image Detail Boost
https://www.youtube.com/embed/GNezJKveMRc
The Image Detail Boost   function increases the contour sharpness of heated objects to 
improve the image detail. The results of the function depend on the selected mode and the 
observation conditions: the higher the object contrast the more noticeable the effect. This 
option is enabled by default but can be disabled in the main menu.
The description of enabling/disabling the Image Detail Boost function is available here.