For the remainder of this chapter, information that describes Entry-Level
Color Graphics devices applies to both the HP VISUALIZE-EG device and the
Internal Color Graphics device.
Device Description |
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Entry-Level Color Graphics devices are found on Series 700 workstations that
have graphics hardware capabilities on their SPU motherboard. In some cases,
they are also available on plug-in cards.
The Entry-Level Color Graphics devices display color from a single bank of
eight planes, supporting up to 256 colors at a time. They have two hardware
color maps to reduce the likelihood of "technicolor" effects (which occur when
two or more applications compete for entries in a single hardware color map).
See the Graphics Administration Guide for information on pixel
resolution and refresh rates for these and other devices.
The following visuals are supported by IVL on the Entry-Level Color Graphics
devices:
Note that only one of the above visuals is supported at a time. The
PseudoColor visual is used by default. If you boot your workstation with a
grayscale monitor type, X11 will initialize itself to a grayscale mode. (This
mode will exclude all access to color visuals. When initialized in a color
mode, the X11 server will support only color visuals.)
Many applications use the default X11 color map. A "technicolor" effect in the
windows using the default color map may occur if a non-default color map is
downloaded into the hardware color map that had previously contained the
default color map.
Because many applications are likely to use the default X11 color map, and
because the Entry-Level Color Graphics devices have two hardware color maps,
the default behavior on these devices is to dedicate one hardware color map to
always hold the default X11 color map. The second hardware color map is
available to applications that use color maps other than the default.
This behavior can still cause the "technicolor" effect if two or more
applications use different, non-default color maps. For example, application A
uses the default X11 color map, application B uses a different color map, and
application C uses a third color map. If applications A, B, and C all execute
simultaneously on an Entry-Level Color Graphics device, application A would
look correct. Either application B or C would show the technicolor effect; the
application whose color map was last downloaded into the second hardware color
map would look correct.
Since there are no overlay planes, overlay transparency is not supported on the
Entry-Level Color Graphics devices.
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