nVariance

Amount of width change that is tolerated between adjacent line slices. If LINE_USE_DPI is set in uProcessFlags, units are in thousandths of an inch, otherwise units are in pixels. This parameter is valid only if LINE_USE_VARIANCE is set in uProcessFlags. For example, the following horizontal line is 30 pixels in length (X represents a pixel)

XXXXXXXXXX 

XXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

XXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

XXXXXXXXXX 

XXXXXXXXXX 

If nVariance is 2 pixels (i.e. tolerate width changes of 2 pixels or less), the first 10 columns and the last 10 columns of the line will be removed. The middle 10 columns will be unchanged. This helps preserve characters that intersect a line that is being removed.