Question

我有一个如下所示的方法将图像保存为jpeg。我希望保存所有具有相同高度和宽度的图片，而不会失真。

我该怎么做？请帮忙

public void SaveFileOnDisk(MemoryStream ms, string FileName)
{
    try
    {
        string appPath = HttpContext.Current.Request.ApplicationPath;
        string physicalPath = HttpContext.Current.Request.MapPath(appPath);
        string strpath = physicalPath + "\\Images";
        string WorkingDirectory = strpath;


        System.Drawing.Image imgSave = System.Drawing.Image.FromStream(ms);
        Bitmap bmSave = new Bitmap(imgSave);
        Bitmap bmTemp = new Bitmap(bmSave);

        Graphics grSave = Graphics.FromImage(bmTemp);
        grSave.DrawImage(imgSave, 0, 0, imgSave.Width, imgSave.Height);

        bmTemp.Save(WorkingDirectory + "\\" + FileName + ".jpg");


        imgSave.Dispose();
        bmSave.Dispose();
        bmTemp.Dispose();
        grSave.Dispose();
    }
    catch (Exception ex)
    {
        //lblMsg.Text = "Please try again later.";
    }

}

Answer 1

调整图像大小并保存

Private void ResizeImage(Image img, double maxWidth, double maxHeight)
{
    double srcWidth = img.Source.Width;
    double srcHeight = img.Source.Height;

    double resizeWidth = srcWidth;
    double resizeHeight = srcHeight;

    double aspect = resizeWidth / resizeHeight;

    if (resizeWidth > maxWidth)
    {
        resizeWidth = maxWidth;
        resizeHeight = resizeWidth / aspect;
    }
    if (resizeHeight > maxHeight)
    {
        aspect = resizeWidth / resizeHeight;
        resizeHeight = maxHeight;
        resizeWidth = resizeHeight * aspect;
    }

    img.Width = resizeWidth;
    img.Height = resizeHeight;
}

您可以使用此代码将图像调整为所需的尺寸，然后再保存

Answer 2

正如其他人所提到的，如果您希望所有图像都具有相同的尺寸而不会失真，那么您需要在保持纵横比的同时调整大小。请参阅以下此功能：

public Image ResizeWithSameRatio(Image image, float width, float height)
{
    // the colour for letter boxing, can be a parameter
    var brush = new SolidBrush(Color.Black);

    // target scaling factor
    float scale = Math.Min(width / image.Width, height / image.Height);

    // target image
    var bmp = new Bitmap((int)width, (int)height);
    var graph = Graphics.FromImage(bmp);

    var scaleWidth = (int)(image.Width * scale);
    var scaleHeight = (int)(image.Height * scale);

    // fill the background and then draw the image in the 'centre'
    graph.FillRectangle(brush, new RectangleF(0, 0, width, height));
    graph.DrawImage(image, new Rectangle(((int)width - scaleWidth)/2, ((int)height - scaleHeight)/2, scaleWidth, scaleHeight));

    return bmp;
}

现在您的使用功能可以大大简化（假设这里有1024x768目标图像）：

public void SaveFileOnDisk(MemoryStream ms, string FileName)
{
    try
    {
        string appPath = HttpContext.Current.Request.ApplicationPath;
        string physicalPath = HttpContext.Current.Request.MapPath(appPath);
        string strpath = physicalPath + "\\Images";
        string WorkingDirectory = strpath;

        using (var original = Image.FromStream(ms))
        using (var resized = ResizeWithSameRatio(original, 1024, 768))
        {
            resized.Save(WorkingDirectory + "\\" + FileName + ".jpg");
        }
    }
    catch (Exception ex)
    {
        //lblMsg.Text = "Please try again later.";
    }
}

请注意在变量数量方面增加的简化，并使用using代替Dispose()进行处理。

在c＃中从memorystream保存为jpeg

2 个答案: