Planar DOME Md4/PCI Installation Manual page 62

46 Chapter 2
Dynamic gray palette
The dynamic gray palette reserves the first 10 and last 10
entries in the palette for the Windows NT operating sys-
tem, but you can manipulate the middle 236 entries. Your
application can create a 256-entry gray ramp in any 8-bit
driver with the WinAPI call,
SetSystemPaletteUse()
but doing so causes all icons to be redrawn in black
and white.
The dynamic gray palette accommodates gray-mapped
Windows colors for the first 10 and last 10 palette entries.
Static gray palette
The static gray palette provides 256 shades of gray in a linear
static palette. This frees the entire grayscale ramp for appli-
cations by not reserving the first 10 and last 10 palette
entries for icons and other standard Windows graphics.
The static gray palette does not provide gray-mapped
Windows colors for the first 10 and last 10 palette entries.
Because the framebuffer assumes the Windows palette is in
use, applications that draw directly to the framebuffer dis-
play incorrectly. For example, icons and button bitmaps
may display in black and white.
The static gray palette cannot be set. The application must
read the palette from the operating system and use it
when drawing directly to the framebuffer.
Calibration with static gray palette
To run the DOME calibration software with the static
gray palette, you need either Luminance Calibration
System 1.5 or later or Calibration TQA 2.0 or later software.