Question

我的图像尺寸有问题。当我上传500 * 500尺寸或其他尺寸的图像时，在这种情况下我想要1024 * 768尺寸图像输出没有压缩。意味着，在图像背景上自动添加其他空间（作为黑色背景或其他）。怎么办，我有什么建议。

1我尝试在固定尺寸的图像控制上显示图像。

的.aspx

<asp:Image ID="ImagePreview1" BorderColor="Aqua" 
      BorderWidth="1px" runat="server"  Height="768px" Width="1024px" />

然后点击按钮保存图像以获取特定文件夹..

.aspx.cs

protected void btnsave_Click(object sender, EventArgs e)
{
    string filepath = ImagePreview1.ImageUrl;
    using (WebClient client = new WebClient())
    {
        client.DownloadFile(filepath, Server.MapPath("~/imgprev/pic.jpg"));
    }

}

在我之间我也使用这段代码。此代码用于压缩图像大小..

System.Drawing.Image fullSizeImg = System.Drawing.Image.FromFile(imagePath);
            var thumbnailImg = new Bitmap(1024, 768);
            var thumbGraph = Graphics.FromImage(thumbnailImg);
            thumbGraph.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
            thumbGraph.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
            thumbGraph.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
            var imageRectangle = new Rectangle(0, 0, 1024, 768);
            thumbGraph.DrawImage(fullSizeImg, imageRectangle);
            string targetPath = imagePath.Replace(Path.GetFileNameWithoutExtension(imagePath), Path.GetFileNameWithoutExtension(imagePath) + "-resize");
            string SName = Path.GetFileName(targetPath);
            string SImgName = ("~/imgprev/") + SName;
            //string st = targetPath.ToString();
            //string stArr = st.Split('\\')[8];        

            thumbnailImg.Save(targetPath, System.Drawing.Imaging.ImageFormat.Jpeg); //(A generic error occurred in GDI+) Error occur here !
            Label1.Text = SImgName.ToString();

            thumbnailImg.Dispose();
            return targetPath;

在不压缩的情况下显示特定尺寸的图像并获得特定尺寸的图像

0 个答案: