1. A computer-readable storage medium comprising instructions that cause a programmable processor to control a graphical user interface for the display of thermal images, the graphical user interface comprising: an image display area presenting an image of a scene, the image having been captured by a thermal imaging device, the image being displayed as a visible light image, a thermal image in a first color scale or monochromatic scale, or a combined visible light image and thermal image in the first color scale or the monochromatic scale, wherein the displayed image includes a temperature band representing a range of temperatures, the range of temperatures being between a band maximum temperature and a band minimum temperature, wherein a portion of the image having a temperature which falls within the range of temperatures is presented in a color or in a second color scale or monochromatic scale that contrasts with the first color scale or monochromatic scale, wherein the band maximum temperature and the band minimum temperature automatically and incrementally increase or decrease over time such that the portion of the displayed image having a temperature which falls within the range of temperatures changes over time.