Pixel board

The pixel board handles the location within the sheet image, as well as the pixel gray value at the (x,y) location.

Level

(output)
Gray value, between 0 and 255, at the (x,y) location.

This field is active only on the initial (gray) image. It becomes inactive on the binary (black & white) image.

X & Y

(input/output)
The abscissa and ordinate values for the selected location (either a single point, or the top left corner of a rectangle).

Width & Height

(input/output)
The width and height values of the selected rectangle. If both are zero, the rectangle degenerates as a single point.