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