Definitions for "Thresholding"
Keywords:  grayscale, pixel, gray, darker, lighter
A technique used primarily with surface rendering, in which a density value of the interface between two materials in the dataset is selected so that the interface surface can be identified for rendering. [KAU91
The assigning of a binary value to a pixel based on whether its intensity falls below, or above a threshold value.
The XIL library's thresholding function sets all the values (in a band) that fall between a low threshold and a high threshold to a value (called a map value) that the programmer specifies.