Image Compress

古城微笑少年丶 2022-09-24 05:16 200阅读 0赞

前言：

图像压缩的格式目前较常用的有jpeg,png，gif和tiff;

jpeg是有损压缩，但压缩比很大；

png是无损压缩，但是压缩比很小，而且用png24才一般不致于图片损失；

gif也是无损压缩，但是压缩比比png还要小，但是因为是隔行存放数据，解码很快

tiff也是无损压缩，压缩比可以较容易调节，一般用于高清出版物，因为是目前最复杂的图象保存格式，所以代码操作起来较麻烦；

好了，直接上代码

static class Program
        {
            /// <summary>
            /// The main entry point for the application.
            /// </summary>
            [STAThread]
            static void Main()
            {
    
                Bitmap myBitmap;
                ImageCodecInfo myImageCodecInfo;
                Encoder myEncoder;
                EncoderParameter myEncoderParameter;
                EncoderParameters myEncoderParameters;
    
                // Create a Bitmap object based on a BMP file.
                myBitmap = new Bitmap(@"D:\BOARD\JH3.bmp");
    
                // Get an ImageCodecInfo object that represents the TIFF codec.
                myImageCodecInfo = GetEncoderInfo("image/tiff");
    
                // Create an Encoder object based on the GUID
                // for the ColorDepth parameter category.
                myEncoder = Encoder.ColorDepth;
    
                // 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 image with a color depth of 24 bits per pixel.
                myEncoderParameter =
                    new EncoderParameter(myEncoder, 24L);
                myEncoderParameters.Param[0] = myEncoderParameter;
                myBitmap.Save(@"d:\Shapes24bpp.tiff", myImageCodecInfo, myEncoderParameters);
    
    
            }
    
    
    
            private static ImageCodecInfo GetEncoderInfo(String mimeType)
            {
                int j;
                ImageCodecInfo[] encoders;
                encoders = ImageCodecInfo.GetImageEncoders();
                for (j = 0; j < encoders.Length; ++j)
                {
                    if (encoders[j].MimeType == mimeType)
                        return encoders[j];
                }
                return null;
            }
        }