Windows 8 tablets
are one of an increasing range of devices to feature a dual input screen, capable
of identifying finger touch and pressure-sensitive pen input in the same glass
screen. The technology is made by Wacom who have a pedigree in digitising and
pressure-sensitive tablets and screens used in the graphic arts.
Unlike Wacom's high-end digitising pads, however, the screen based digitising
technology does not recognise the pen position precisely, paticularly in corners
and along edges of the screen, and requires calibration to minimise this effect.
Microsoft includes a utility to do this which provides a default grid of points
across and down the screen. Users who want to fine-tune their screen can use the
same utility via the command line to create a grid with a large number of
Here's an example of the command and its arguments:
tabcal lincal novalidate XGridPts=2,20,200,855,1720,1810,1900,1918
The XGridPoints and YGridPoints arguments
are a comma-separated list of points on screen at which a grid point will be
defined within the calibration utility.
The utility I've written will create this command for you based on your screen
size and positions of lines from the edges of the screen. The application defaults
to settings for the Microsoft Surface
Pro and includes a series of screen points I've found useful for its
You can change the series by creating a comma separated list of points up to
half of your screen's width resolution. Any points beyond that point will be
discarded when calculating the command.
The utility will create a command and copy it to the clipboard. Open a command
window or paste this command into the Start > File > Run... dialog box to