HP sv6 - Manual (Page 83)

installation and user information
optimization
Chapter 2 83
WARNING Do not add this environment variable to /etc/X11/X0screens. That
would disable all scaling for everything rendered to the screen.
By applying it only to the desired application, you can leave
scaling enabled for everything else not inside the immediate
mode application’s windows. In short, you should never set this
variable so that it is applied to your user or system environment.
It MUST be applied specifically to the invocation of applications
that require it. A good way to do this is to set it in a script, which
invokes the application.
gamma correction in pass through mode
The hp visualization center sv6 supports 3-channel gamma correction
(i.e. red, green, and blue can all be controlled individually). However,
pass through mode only allows for 1-channel gamma correction. To allow
for normal sv6 mode and pass through mode to co-exist, the pass through
mode simply uses the sv6's red gamma channel as the pass through
gamma correction value for red, green, and blue.
pass through mode on a multi-channel sv6
A side effect of pass through mode is that an application cannot use the
full area of a multi-channel display such as a power-wall. This is because
the application is operating exactly as it would on a standard desktop
workstation, and so it has no access to the sv6 channels, which are driv-
ing other monitors or projectors in the display. The result of this is that
an application in pass through mode is constrained to the area of the dis-
play handled by the channel driven by the application master worksta-
tion. Typically, for a two- or three- channel system, this is the left-most
channel. Furthermore, if the display is projected and uses edge-blending
technology for a seamless image, the overlap region may prove
out-of-bounds too, because the brightness of the application’s window
will fall off as it approaches the edge of the channel (because its pixels
are not duplicated in the channel next to it). Therefore it may be neces-
sary to resize the window a little to ensure that it doesn’t enter the blend
region.
Note that applications that do not require pass through mode can use
any region of the full multi-channel display, and are not affected by pass
through applications that may be running at the same time.