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'Create a new project, add a command button and a picture box to the project, load a picture into the picture box.
'Paste this code into Form1
Private Type BITMAP
    bmType As Long
    bmWidth As Long
    bmHeight As Long
    bmWidthBytes As Long
    bmPlanes As Integer
    bmBitsPixel As Integer
    bmBits As Long
End Type
Private Declare Function GetObject Lib "gdi32" Alias "GetObjectA" (ByVal hObject As Long, ByVal nCount As Long, lpObject As Any) As Long
Private Declare Function GetBitmapBits Lib "gdi32" (ByVal hBitmap As Long, ByVal dwCount As Long, lpBits As Any) As Long
Private Declare Function SetBitmapBits Lib "gdi32" (ByVal hBitmap As Long, ByVal dwCount As Long, lpBits As Any) As Long
Dim PicBits() As Byte, PicInfo As BITMAP, Cnt As Long
Private Sub Command1_Click()
    'KPD-Team 1999
    'URL: http://www.allapi.net/
    'E-Mail: KPDTeam@Allapi.net
    'Get information (such as height and width) about the picturebox
    GetObject Picture1.Image, Len(PicInfo), PicInfo
    'reallocate storage space
    ReDim PicBits(1 To PicInfo.bmWidth * PicInfo.bmHeight * 3) As Byte
    'Copy the bitmapbits to the array
    GetBitmapBits Picture1.Image, UBound(PicBits), PicBits(1)
    'Invert the bits
    For Cnt = 1 To UBound(PicBits)
        PicBits(Cnt) = 255 - PicBits(Cnt)
    Next Cnt
    'Set the bits back to the picture
    SetBitmapBits Picture1.Image, UBound(PicBits), PicBits(1)
    'refresh
    Picture1.Refresh
End Sub


 
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