必须用代码处理
Dim imgs As new List(Of image)
Dim w As Integer = 0
Dim h As Integer = 0
For i As Integer = 1 To 3
imgs.Add(getimage("d:\page" & i & ".jpg"))
h += imgs(i-1).Height
w = imgs(i-1).width
Next
Dim bmp As New bitmap(w, h)
Dim g As Graphics = Graphics.FromImage(bmp)
Dim offset As Integer = 0
For Each img As image In imgs
g.DrawImage(img, 0, offset, img.width, img.height)
offset += img.height
Next
bmp.Save("D:\pagesss.jpg", Imaging.ImageFormat.Jpeg)
g.Dispose()