The Mode property returns the color mode of the bitmap.
Examples:
The following VBA example displays the number of bitmaps in the RGB color mode.
Sub Test()
Dim s As Shape, n As Long
n = 0
For Each s In ActivePage.Shapes
If s.Type = cdrBitmapShape Then
If s.Bitmap.Mode = cdrRGBColorImage Then n = n + 1
End If
Next s
MsgBox "There are " & n & " RGB bitmaps."
End Sub