xtestpicture - draw a simple monitor test pattern
xtestpicture [-s[aturated]] [-d[isplay] display]
This program creates a single window covering the whole screen, and draws
several test patterns in it. The window is configured to be not intercepted by
a window manager and raised to the top of the window stack, so it should be
the only picture on the screen at all.
A couple of lines between the opposite corners, two rectangles near the border
of the screen, a single rectangle, and a circle in the middle of the screen
are mainly useful for convergency and linearity considerations.
A box with alternating black and white vertical lines above the center of the
screen, two pixels thick on the left side and one pixel thick each on the
right side is intented to evaluate the sharpness and bandwidth of the monitor.
Finally, there's a box containing a palette of eight colors. These are the basic
CRT colors red
, and blue
, along with their mutual
mixture colors magenta
, and white
accompanied by a black rectangle to complete the series. The colors are fully
saturated in the top row, i. e. with 100 % intensity and not intermixed with
white, while the saturation decreases in steps of 25 % towards the bottom row,
which is plain gray scale (0 % saturation).
Since this color palette causes a total cost of 32 color cells, it can be
avoided by starting xtestpicture
with the option -s[aturated]
This will cause the program to display only fully saturated colors.
The program will exit if any pointer button is pressed.
Specifying the option -v[ersion]
will cause the program to print its
version identification to stderr and exit.
Joerg Wunsch, Dresden <firstname.lastname@example.org>