temperature and gray level realtion

I have this thermal image and i want to know is there any kind of relation between temperature and gray levels (pixel intensity)

[KSSV]

YOu can relate...it depends on the colormap you have picked.......didn't this answer help?

https://in.mathworks.com/matlabcentral/answers/456417-temperature-and-gray-level?s_tid=prof_contriblnk