在上传过程中调整和优化网页图像的最佳类是什么?

这是我用来调整大小的方法，当我指定所需的宽度:

private Image ResizeImage(Image original, int targetWidth)
{
    double percent = (double)original.Width / targetWidth;
    int destWidth = (int)(original.Width / percent);
    int destHeight = (int)(original.Height / percent);
    Bitmap b = new Bitmap(destWidth, destHeight);
    Graphics g = Graphics.FromImage((Image)b);
    try
    {
        g.InterpolationMode = InterpolationMode.HighQualityBicubic;
        g.SmoothingMode = SmoothingMode.HighQuality;
        g.PixelOffsetMode = PixelOffsetMode.HighQuality;
        g.CompositingQuality = CompositingQuality.HighQuality;
        g.DrawImage(original, 0, 0, destWidth, destHeight);
    }
    finally
    {
        g.Dispose();
    }
    return (Image)b;
}

这个似乎在这些地方很受重视。

这个问题的其他答案包括指向其他几个选项的链接，包括Imagemagick

public static class clsImageResize
{
    public static int TnewWidth { get; set; }
    public static int TnewHeight { get; set; }
    public static string TfilePath { get; set; }
    public static void Resize(string filePath, int newWidth, int newHeight)
    {
        TfilePath = filePath;
        TnewWidth = newWidth;
        TnewHeight = newHeight;
        Bitmap image = new Bitmap(TfilePath);
        //Image m = Image.FromFile(TfilePath);
        Save(image, TnewWidth, TnewHeight, 8, TfilePath);
    }
    private static void Save(Bitmap image, int maxWidth, int maxHeight, int quality, string filePath)
    {
        // Get the image's original width and height
        int originalWidth = image.Width;
        int originalHeight = image.Height;
        // To preserve the aspect ratio
        float ratioX = (float)maxWidth / (float)originalWidth;
        float ratioY = (float)maxHeight / (float)originalHeight;
        float ratio = Math.Min(ratioX, ratioY);
        // New width and height based on aspect ratio
        int newWidth = (int)(originalWidth * ratio);
        int newHeight = (int)(originalHeight * ratio);
        // Convert other formats (including CMYK) to RGB.
        Bitmap newImage = new Bitmap(newWidth, newHeight, PixelFormat.Format24bppRgb);
        // Draws the image in the specified size with quality mode set to HighQuality
        using (Graphics graphics = Graphics.FromImage(newImage))
        {
            graphics.CompositingQuality = CompositingQuality.HighQuality;
            graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
            graphics.SmoothingMode = SmoothingMode.HighQuality;
            graphics.DrawImage(image, 0, 0, newWidth, newHeight);
        }
        // Get an ImageCodecInfo object that represents the JPEG codec.
        ImageCodecInfo imageCodecInfo = GetEncoderInfo(ImageFormat.Jpeg);
        // Create an Encoder object for the Quality parameter.
        Encoder encoder = Encoder.Quality;
        // Create an EncoderParameters object. 
        EncoderParameters encoderParameters = new EncoderParameters(1);
        image.Dispose();
        // Save the image as a JPEG file with quality level.
        EncoderParameter encoderParameter = new EncoderParameter(encoder, quality);
        encoderParameters.Param[0] = encoderParameter;
        newImage.Save(filePath, imageCodecInfo, encoderParameters);
    }
    private static ImageCodecInfo GetEncoderInfo(ImageFormat format)
    {
        return ImageCodecInfo.GetImageDecoders().SingleOrDefault(c => c.FormatID == format.Guid);
    }
}