LENS(1)LENS(1)NAMElens - interactive screen magnifier
Lens presents a magnified view in its window of an arbitrary area on
the screen. The default magnification is 4 (showing each pixel as a
4×4 pixel block in lens's window). This may be changed by typing a
digit on the keyboard (with 0 standing for 10), or by using the + and -
keys to increase or decrease the magnification by one unit. The lower
limit is ×1; the upper ×16.
The interface to indicate what area to magnify is dictated by the mouse
multiplexing rules of rio(1). Start by pressing mouse button 1 in the
lens window and dragging, with the button pressed, to the center of the
area to magnify. Lens will update the display as the mouse moves.
Releasing the button freezes the lens display. The magnified view is
static—a snapshot, not a movie—but typing a space or . key in the
lens window will refresh the display, as will changing the magnifica‐
To make counting pixels easier, typing a g toggles whether a checker‐
board grid is imposed on the magnified area.
Button 3 brings up a menu of actions.
There should be an easier way to indicate what to magnify.