The DeviceEntriesInAColorTable property indicates the number of color indexes in a color table of a display device. If the ...

The DeviceEntriesInAColorTable property indicates the number of color indexes in a color table of a display device. If the device has a color depth of no more than 8 bits per pixel. For devices with greater color depths, -1 is returned.
Example: 256  
This property has been deprecated in favor of a corresponding property(s) contained in the Win32_VideoController, Win32_DesktopMonitor and//or CIM_VideoControllerResolution