The PaletteType property specifies the type of palette to use. You can specify one of the predefined palettes (Windows, Internet Explorer, Netscape, Black Body, or VGA), or you can generate a new optimized, uniform, or adaptive palette.
Examples:
The following VBA example exports the drawing using the Netscape Web-safe palette:
Sub Test()
Dim pal As New StructPaletteOptions
Dim flt As ExportFilter
pal.PaletteType = cdrPaletteNetscape
Set flt = ActiveDocument.ExportBitmap("C:\Temp\img.gif", cdrGIF, , cdrPalettedImage, PaletteOptions:=pal)
flt.Finish
End Sub