System information

OMI 2.3.1 Release Notes
42 OMI 2.3.1 Release Notes
Display Notes
Fast Live Video and Desktop Color Depth
When using some PCI-based video cards, you may experience high CPU usage if you
display live grey-scale video with your Windows desktop set to a color depth other than
256-color or 65,536-color (High Color) modes. This does not occur with the
recommended AGP-based video cards.
If you detect high CPU usage (as shown by the Window NT Task Manager, or the
Windows 98 System Monitor), set your Windows desktop to 256-color mode or
65,536-color (High Color) mode before launching OMIWin to display live grey-scale
video.
To display live color video using the MVS-8100C and a color camera, the Windows
desktop must be set to either 16-bit color depth (called 65,536 colors or High Color) or
32-bit color depth (called True Color).
Note Some Windows 98 video drivers offer a "High Color 16-bit" option
that actually offers only 15-bit color depth (32,768 colors). Live color
video will not work at this resolution using these drivers. If you
suspect you are having this problem, contact Cognex Technical
Support.
Colormap Flashing When Switching Apps Using
256-color Desktop
If you set the Windows desktop to use 256 colors, Windows uses a palette of 256 colors,
and the topmost window on the Windows desktop imposes its palette on all other
windows. If you switch between applications, each application re-imposes its own
palette on the entire Windows desktop as it becomes the topmost active window. This
is known as colormap flashing and is normal for all 256-color desktop windowing
systems.
Under these conditions, if you select another application while leaving the OMIWin
window visible, the OMIWin window may not display its colors correctly. When you
reselect the OMIWin window, its colors will be displayed correctly again. To avoid
colormap flashing altogether, set the Windows desktop to use a higher color depth as
described in the previous section.