求一个图片压缩率高一点的方法

[hercules135]

        public static void thumb(string rSrcImgPath, string rDstImgPath, int width, string lv = "h", int height = 0)
        {
            //利用Image对象装载源图像
            System.Drawing.Image image = System.Drawing.Image.FromFile(rSrcImgPath); 

            //创建一个System.Drawing.Bitmap对象，并设置你希望的缩略图的宽度和高度。
            int thumbWidth, thumbHeight;
            double srcWidth = image.Width;
            double srcHeight = image.Height;
            if (height == 0)//如果高度height为0,则原比例缩放
            {
                thumbWidth = width;
                double d = srcHeight / srcWidth;
                thumbHeight = Convert.ToInt32( d * width );
            }
            else//否则按要求宽高生成
            {
                thumbWidth = width;
                thumbHeight = height;
            }
            Bitmap bmp = new Bitmap(thumbWidth, thumbHeight); 

            //从Bitmap创建一个System.Drawing.Graphics对象，用来绘制高质量的缩小图。
            System.Drawing.Graphics gr = System.Drawing.Graphics.FromImage(bmp);

            if (lv=="h")
            {
                //设置 System.Drawing.Graphics对象的SmoothingMode属性为HighQuality
                gr.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
                //下面这个也设成高质量
                gr.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
                //下面这个设成High
                gr.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;
            }
            else if (lv=="m")
            {
                gr.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.None;

                gr.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.Default;

                gr.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.Default;

            }
            else if (lv=="l")
            {
                gr.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.None;

                gr.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighSpeed;

                gr.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.Low;
            }



            //把原始图像绘制成上面所设置宽高的缩小图
            System.Drawing.Rectangle rectDestination = new System.Drawing.Rectangle(0, 0, thumbWidth, thumbHeight);
            gr.DrawImage(image, rectDestination, 0, 0,Convert.ToInt32( srcWidth),Convert.ToInt32( srcHeight), GraphicsUnit.Pixel);

            //保存图像，大功告成！
            bmp.Save(rDstImgPath);

            //最后别忘了释放资源
            bmp.Dispose();
            image.Dispose();
        }

现在用的这个图片压缩方法,感觉质量太高...也就是体积太大,请问有没有压缩的更狠一点的方法,新人求推荐啊

[xdashewan]

你这个应该不是压缩而是缩放，需要搜索图片缩放相关资料

[hercules135]

引用 1 楼 xdashewan 的回复:

你这个应该不是压缩而是缩放，需要搜索图片缩放相关资料

恩 就是要做缩略图嘛,指定了宽高之后再压缩

[xdashewan]

引用 2 楼 hercules135 的回复:

恩 就是要做缩略图嘛,指定了宽高之后再压缩

搜一下，网上这类很多，至于哪个符合你要求，你只能自己试

[Poopaye]

        Bitmap myBitmap;
        ImageCodecInfo myImageCodecInfo;
        Encoder myEncoder;
        EncoderParameter myEncoderParameter;
        EncoderParameters myEncoderParameters;

        // Create a Bitmap object based on a BMP file.
        myBitmap = new Bitmap("Shapes.bmp");

        // Get an ImageCodecInfo object that represents the JPEG codec.
        myImageCodecInfo = GetEncoderInfo("image/jpeg");

        // Create an Encoder object based on the GUID

        // for the Quality parameter category.
        myEncoder = Encoder.Quality;

        // Create an EncoderParameters object.

        // An EncoderParameters object has an array of EncoderParameter

        // objects. In this case, there is only one

        // EncoderParameter object in the array.
        myEncoderParameters = new EncoderParameters(1);

        // Save the bitmap as a JPEG file with quality level 25.
        myEncoderParameter = new EncoderParameter(myEncoder, 25L);
        myEncoderParameters.Param[0] = myEncoderParameter;
        myBitmap.Save("Shapes025.jpg", myImageCodecInfo, myEncoderParameters);

[IE11下面经常卡到爆]

lv参数给m或者l试试

[hercules135]

引用 5 楼 dongxinxi 的回复:

lv参数给m或者l试试

这个lv是我自己修改后加上去的...效果不明显,所以想请教各位前辈有没有更好的方法