Private Sub Image1_Click()
Dim a&, b&
a = Application.Height: b = Application.Width
With UserForm1
With .Image1
.AutoSize = .AutoSize: .PictureSizeMode = fmPictureSizeModeZoom
.Height = a / 4: .Width = b / 4
End With
.Height = a / 2: .Width = b / 2
End With
End Sub