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 [英] Display Image on particular size without compress and get image with particular size

问题描述

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我试图在固定尺寸的图像控制上显示图像。



.aspx

I have problem with image dimensions. when i have upload image with 500*500 dimensions or other, In this case i want 1024*768 dimensions Image output without compress. means, other space are automatic added (as a black background or other) on image background. How can do i, any suggest for that.

1st i have try to display image on image control with fixed size.

.aspx

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

< br $>


aspx.cs

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"));
    }

}

介于两者之间我也使用此代码。此代码用于压缩图像大小..

In between i have also working with this code. This code for compress image size..

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;

推荐答案

ASPX

ASPX

<table>
           <tr>
               <td style="vertical-align: top">
                   <asp:Label ID="OriginalImageLabel" Font-Bold="true" runat="server">Original Image</asp:Label>
               </td>
               <td>
                   <asp:Image ID="Image" ImageUrl="~/Images/Images.jpg" runat="server" BorderColor="Aqua"

                       BorderWidth="1px" Height="500px" Width="500px" />
               </td>
           </tr>
           <tr>
               <td style="vertical-align: top">
                   <asp:Label ID="ResizeImageLabel" Font-Bold="true" Text="Re-Size Image" runat="server"></asp:Label>
               </td>
               <td>
                   <asp:Image ID="ResizeImage" runat="server" />
               </td>
           </tr>
           <asp:Button ID="ResizeButton" runat="server" Text="Resize" OnClick="ResizeButton_click" />
       </table>

ASPX.CS

ASPX.CS

<br />
using System;<br />
using System.Collections.Generic;<br />
using System.Drawing;<br />
using System.Drawing.Drawing2D;<br />
using System.Linq;<br />
using System.Web;<br />
using System.Web.UI;<br />
using System.Web.UI.WebControls;<br />
<br />
public partial class _Default : System.Web.UI.Page<br />
{<br />
    protected void Page_Load(object sender, EventArgs e)<br />
    {<br />
<br />
    }<br />
<br />
    #region Events<br />
    protected void ResizeButton_click(object sender,EventArgs e)<br />
    {<br />
        string path = Server.MapPath("~/Images");<br />
        System.Drawing.Image img = System.Drawing.Image.FromFile(string.Concat(path, "/images.jpg"));<br />
        img = resizeImage(img);<br />
        img.Save(string.Concat(path,"/new.jpg"));<br />
        ResizeImage.ImageUrl="~/Images/new.jpg";<br />
<br />
<br />
    }<br />
    #endregion<br />
<br />
    #region Private Methods<br />
<br />
<br />
    private System.Drawing.Image resizeImage(System.Drawing.Image img)<br />
    {<br />
        Bitmap b = new Bitmap(img);<br />
        System.Drawing.Image i = resizeImage(b, new Size(1024, 768));<br />
        return i;<br />
    }<br />
<br />
<br />
<br />
    private static System.Drawing.Image resizeImage(System.Drawing.Image imgToResize, Size size)<br />
    {<br />
        //Get the image current width<br />
        int sourceWidth = imgToResize.Width;<br />
        //Get the image current height<br />
        int sourceHeight = imgToResize.Height;<br />
<br />
        float nPercent = 0;<br />
        float nPercentW = 0;<br />
        float nPercentH = 0;<br />
        //Calulate  width with new desired size<br />
        nPercentW = ((float)size.Width / (float)sourceWidth);<br />
        //Calculate height with new desired size<br />
        nPercentH = ((float)size.Height / (float)sourceHeight);<br />
        <br />
<br />
        if (nPercentH < nPercentW)<br />
            nPercent = nPercentH;<br />
        else<br />
            nPercent = nPercentW;<br />
        //New Width<br />
        int destWidth = (int)(sourceWidth * nPercent);<br />
        //New Height<br />
        int destHeight = (int)(sourceHeight * nPercent);<br />
<br />
        Bitmap b = new Bitmap(destWidth, destHeight);<br />
        Graphics g = Graphics.FromImage((System.Drawing.Image)b);<br />
        g.InterpolationMode = InterpolationMode.HighQualityBicubic;<br />
        // Draw image with new width and height<br />
        g.DrawImage(imgToResize, 0, 0, destWidth, destHeight);<br />
        g.Dispose();<br />
<br />
        return (System.Drawing.Image)b;<br />
    }<br />
   <br />
  <br />
    #endregion<br />
}<br />
<br />
<br />

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