ASPJPEG这个控件是com的还是.net的？

我来帮你吧：是com组件啊，具体给你个例子，你看他的用法就可以辨别了，比较明显的：

<%
' Create instance of AspJpeg
Set Jpeg = Server.CreateObject("Persits.Jpeg")
' Open source image
Jpeg.Open "c:\path\myimage.jpg"

' New width
L = 100

' Resize, preserve aspect ratio
Jpeg.Width = L
Jpeg.Height = Jpeg.OriginalHeight * L / Jpeg.OriginalWidth

' create thumbnail and save it to disk
Jpeg.Save "c:\path\thumbnail.jpg"

%>