各位大大们、
有谁有 jpeg huffman 压缩的类不。。给我个。。
不好找啊。。
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感觉没必要压缩
换成byte[]
MemeryStream ms = new MemeryStream();
PicruteBox.Image.Save(ms,Imaging.ImageFormat.Jpeg);
byte[] bytes=ms.ToArray();
源码
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JPEG天生就不是无损的，失真算法怎么可能无损压缩？
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http://archive.cnblogs.com/a/2007463/
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嗯，我理解你的意思了...你所谓的“无损”其实是人眼难以察觉的失真，每张图片差异很大，每个人眼也有差异，想要找要一个刚好人眼难以察觉的失真“度”...很明确地告诉你，计算机不可能做到...
想要找到一个对所有图片都统一压缩率的人眼难以察觉的失真“度”更是不可能的...
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jpeg还能无损？用png吧。
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可以去看看
一个.net 压缩位图至JPEG的代码
asp.net JPEG无损压缩
asp.net JPEG无损压缩
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- C# code
using System;using System.Text;using System.Runtime.Serialization;using System.Runtime.Serialization.Formatters.Binary;using System.Collections;using System.IO;using Microsoft.Win32;using System.Diagnostics;/// <summary>/// Compress 的摘要说明/// </summary>public class CompressFiles{ /// <summary> /// 压缩文件 /// </summary> /// <param name="DFilePath">需要压缩的文件夹或者单个文件</param> /// <param name="DRARName">生成压缩文件的文件名</param> /// <param name="DRARPath">生成压缩文件保存路径</param> /// <returns></returns> public static bool CompressRAR(string DFilePath, string DRARName, string DRARPath) { String the_rar; RegistryKey the_Reg; Object the_Obj; String the_Info; ProcessStartInfo the_StartInfo; Process the_Process; try { the_Reg = Registry.ClassesRoot.OpenSubKey(@"Applications\WinRAR.exe\Shell\Open\Command"); the_Obj = the_Reg.GetValue(""); the_rar = the_Obj.ToString(); the_Reg.Close(); the_rar = the_rar.Substring(1, the_rar.Length - 7); the_Info = " a " + " " + DRARName + " " + DFilePath + " -ep1"; //命令 + 压缩后文件名 + 被压缩的文件或者路径 the_StartInfo = new ProcessStartInfo(); the_StartInfo.FileName = the_rar; the_StartInfo.Arguments = the_Info; the_StartInfo.WindowStyle = ProcessWindowStyle.Hidden; the_StartInfo.WorkingDirectory = DRARPath; //RaR文件的存放目录。 the_Process = new Process(); the_Process.StartInfo = the_StartInfo; the_Process.Start(); the_Process.WaitForExit(); the_Process.Close(); return true; } catch (Exception ex) { return false; } } /// <summary> /// 解压缩到指定文件夹 /// </summary> /// <param name="RARFilePath">压缩文件存在的目录 </param> /// <param name="RARFileName">压缩文件名称 </param> /// <param name="UnRARFilePath">解压到文件夹</param> /// <param name="isCovering">是否覆盖原来文件</param> /// <returns></returns> public static bool DecompressionRAR(string RARFilePath, string RARFileName, string UnRARFilePath, bool isCovering) { //解压缩 String the_rar; RegistryKey the_Reg; Object the_Obj; String the_Info; ProcessStartInfo the_StartInfo; Process the_Process; try { the_Reg = Registry.ClassesRoot.OpenSubKey(@"Applications\WinRar.exe\Shell\Open\Command"); the_Obj = the_Reg.GetValue(""); the_rar = the_Obj.ToString(); the_Reg.Close(); the_rar = the_rar.Substring(1, the_rar.Length - 7); if (isCovering) { the_Info = @"x -o+" + " " + RARFilePath + RARFileName + " " + UnRARFilePath; } else { the_Info = @"x -o-" + " " + RARFilePath + RARFileName + " " + UnRARFilePath; } the_StartInfo = new ProcessStartInfo(); the_StartInfo.FileName = the_rar; the_StartInfo.Arguments = the_Info; the_StartInfo.WindowStyle = ProcessWindowStyle.Hidden; the_Process = new Process(); the_Process.StartInfo = the_StartInfo; the_Process.Start(); return true; } catch (Exception ex) { return false; } }}