尝试一下，

从 .NET Targa图像阅读器下载源代码 [

Try this,

Download the source from .NET Targa Image Reader[^]
Include the TargaImage.dll in bin folder and reference it to the project,

In aspx code,

<asp:Image ID="Image1" ImageUrl="~/Handler.ashx" runat="server" />

在Handler.ashx,
中 using System.Drawing;

In Handler.ashx,
using System.Drawing;

Bitmap tga = Paloma.TargaImage.LoadTargaImage(@"C:/my folder/TargaReaderDemo/Image/img.tga");
            Response.ContentType = "image/jpeg";
            tga.Save(Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg);

请参阅此CodeProject文章: ^ ].

—SA

Please see this CodeProject article: .NET Targa Image Reader[^].

—SA