Option Explicit
'---------------------------------------------------------------------
Function ColorIndex(rng As Range, _
                    Optional text As Boolean = False) As Variant
'---------------------------------------------------------------------
On Error Resume Next
Dim cell As Range, row As Range
Dim i As Long, j As Long
Dim iWhite As Long, iBlack As Long
Dim aryColours As Variant
    If rng.Areas.Count > 1 Then
        ColorIndex = CVErr(xlErrValue)
        Exit Function
    End If
    iWhite = WhiteColorindex(rng.Worksheet.Parent)
    iBlack = BlackColorindex(rng.Worksheet.Parent)
    If rng.Cells.Count = 1 Then
        If text Then
            aryColours = DecodeColorIndex(rng, True, iBlack)
        Else
            aryColours = DecodeColorIndex(rng, False, iWhite)
        End If
    Else
        aryColours = rng.Value
        i = 0
        For Each row In rng.Rows
            i = i + 1
            j = 0
            For Each cell In row.Cells
                j = j + 1
                If text Then
                    aryColours(i, j) = _
                      DecodeColorIndex(cell, True, iBlack)
                Else
                    aryColours(i, j) = _
                      DecodeColorIndex(cell, False, iWhite)
                End If
            Next cell
        Next row
    End If
    ColorIndex = aryColours
End Function
'---------------------------------------------------------------------
Private Function WhiteColorindex(oWB As Workbook)
'---------------------------------------------------------------------
Dim iPalette As Long
    WhiteColorindex = 0
    For iPalette = 1 To 56
        If oWB.Colors(iPalette) = &HFFFFFF Then
            WhiteColorindex = iPalette
            Exit Function
        End If
    Next iPalette
End Function
'---------------------------------------------------------------------
Private Function BlackColorindex(oWB As Workbook)
'---------------------------------------------------------------------
Dim iPalette As Long
    BlackColorindex = 0
    For iPalette = 1 To 56
        If oWB.Colors(iPalette) = &H0 Then
            BlackColorindex = iPalette
            Exit Function
        End If
    Next iPalette
End Function
'---------------------------------------------------------------------
Private Function DecodeColorIndex(rng As Range, _
                                  text As Boolean, _
                                  idx As Long)
'---------------------------------------------------------------------
Dim iColor As Long
    If text Then
        iColor = rng.Font.ColorIndex
    Else
        iColor = rng.Interior.ColorIndex
    End If
    If iColor < 0 Then
        iColor = idx
    End If
    DecodeColorIndex = iColor
End Function
'---------------------------------------------------------------------