Black/White By Threshold
This command makes the current image binary by assigning grays and
colors to either black or white based on a brightness threshold. A
binary image is easier to process in commands like Raster To Text
and and Raster To Vector. The Calculate Threshold function analyzes
the image using the specified Threshold Method to estimate a good
threshold value.
Pulldown Menu Location: Raster
Keyboard Command: rasthreshold
Prerequisite: Set Raster Image