ColorThreshold - contrast setting for color images
ColorThreshold is the color value used by the control to decide whether a pixel should be considered to be black or white. The value should be in the range 0 to 255.
Please note that if this property is set to a non-zero value than ColorProcessingLevel is effectively set to a value of 0. It is recommended to set this property to 0 and control the accuracy of reading from color images through the ColorProcessingLevel property.
Default value: 0