Color values are typically four-byte integers and commonly use little-endian and big-endian format. Microsoft Windows and ActiveX use the little-endian format, which stores red, green, and blue color components in the 0x00BBGGRR byte positions. LabVIEW and LabWindows/CVI use the big-endian format, which stores the color components in the 0x00RRGGBB byte positions.

If you are specifying a color value in an expression, you can use a predefined little-endian color constant, such as tsRed or tsDarkBlue. Refer to Constants»Color on the Operators/Functions tab of the Expression Browser dialog box for the list of available expression color constants. Use the ConvertColor expression function to convert the two color value formats.

Some Windows and ActiveX functions support specifying a system color using the 0x800000xx byte format, where xx is a valid Win32 GetSysColor index. The possible values are listed below.

• 0x00bbggrr—Where bb specifies the intensity of the color blue, gg specifies the intensity of the color green, and rr specifies the intensity of the color red.
• 0x800000xx—Where xx is a valid Win32 GetSysColor index. The possible values are listed below.

  Constant	Value
  COLOR_SCROLLBAR	0
  COLOR_BACKGROUND	1
  COLOR_ACTIVECAPTION	2
  COLOR_INACTIVECAPTION	3
  COLOR_MENU	4
  COLOR_WINDOW	5
  COLOR_WINDOWFRAME	6
  COLOR_MENUTEXT	7
  COLOR_WINDOWTEXT	8
  COLOR_CAPTIONTEXT	9
  COLOR_ACTIVEBORDER	10
  COLOR_INACTIVEBORDER	11
  COLOR_APPWORKSPACE	12
  COLOR_HIGHLIGHT	13
  COLOR_HIGHLIGHTEXT	14
  COLOR_BTNFACE	15
  COLOR_BTNSHADOW	16
  COLOR_GRAYTEXT	17
  COLOR_BTNTEXT	18
  COLOR_INACTIVECAPTIONTEXT	19
  COLOR_BTNHIGHLIGHT	20
  COLOR_3DDKSHADOW	21
  COLOR_3DLIGHT	22
  COLOR_INFOTEXT	23
  COLOR_INFOBK	24
  COLOR_HOTLIGHT	26
  COLOR_GRADIENTACTIVECAPTION	27
  COLOR_GRADIENTINACTIVECAPTION	28
  COLOR_MENUHILIGHT	29
  COLOR_MENUBAR	30