GTCO Summagraphics ADB Interface - Users Guide - Manual (Page 21)

Summagraphics 21
Two scroll bars control PixScale. Each click on an arrow changes the PixScale by 1 pixel.
Each click in the gray area changes the PixScale by 5 pixels. To make large changes, drag
the scroll box.
The minimum PixScale is 1 ppi. The maximum PixScale is 1000 ppi. These are extremes
and it would be unlikely that you would use them. A PixScale of one means that moving
the stylus/cursor one inch on the tablet would only move the pointer one pixel. A PixScale
of 1000 means that moving the stylus/cursor one inch on the tablet would move the
pointer 1000 pixels.
The best way of learning about PixScale is to experiment with it. Six scenarios appear
below that demonstrate the most common situations. But first, here are some hints:
 If the screen resolution is specified as the total number of pixels along the axis, then
you need to convert it to pixels per inch (mm). For example, if the screen resolution
is:
X resolution = 512 pixels
Y resolution = 342 pixels
And, the screen axes are:
X axis is 7 1/8 inches long
Y axis is 4 ¾ inches long
Then, the conversion is:
512 pixels + 7 1/8 inches = 72 pixels per inch
342 pixels + 4 ¾ inches = 72 pixels per inch
 In the case where the screen resolution is specified as the total pixel count along an
axis, there is something else to be careful of. Are the pixel counts for the maximum
screen dimensions or for only the active portion of the screen? For example, the
standard Macintosh screen has a resolution of 512 pixels along the X axis; 342 pixels