压缩比
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
namespace 图像压缩
{
public class image2
{
///
/// 按质量比和尺寸收缩呗数,生成缩略图，保存为另外路劲
///
/// 原始图片文件
/// 质量压缩比
/// 收缩倍数
/// 输出文件名
/// 成功返回true,失败则返回false
public bool getThumImage(String sourceFile, long quality, int multiple, String outputFile)
{
bool flag = false;
try
{
flag = ThumImage(sourceFile, quality, multiple, outputFile);
}
catch
{
flag = false;
}
return flag;
}
/**/
/// <summary>
/// 按质量比和尺寸收缩呗数,生成缩略图;保存在同一路径
/// </summary>
/// <param name="sourceFile">原始图片文件</param>
/// <param name="quality">质量压缩比</param>
/// <param name="multiple">收缩倍数</param>
/// <param name="outputFile">输出文件名</param>
/// <returns>成功返回true,失败则返回false</returns>
public bool getThumImage(String sourceFile, long quality, int multiple)
{
bool flag = false;
try
{
flag = ThumImage(sourceFile, quality, multiple, sourceFile);
}
catch
{
flag = false;
}
return flag;
}
/// <summary>
/// 按图片尺寸大小压缩图片 ，保存在不同路径
/// </summary>
/// <param name="sourceFile">原始图片文件</param>
/// <param name="multiple">收缩倍数</param>
/// <returns>成功返回true,失败则返回false</returns>
public bool ImageByMultiple(String sourceFile, int multiple, String outputFile)
{
bool flag = false;
try
{
flag = ThumImageByMultiple(sourceFile, multiple, outputFile);
}
catch
{
flag = false;
}
return flag;
}
/// <summary>
/// 按图片尺寸大小压缩图片 ，保存在同一路径
/// </summary>
/// <param name="multiple">收缩倍数</param>
/// <returns>成功返回true,失败则返回false</returns>
public bool ImageByMultiple(String sourceFile, int multiple)
{
bool flag = false;
try
{
flag = ThumImageByMultiple(sourceFile, multiple, sourceFile);
}
catch
{
flag = false;
}
return flag;
}
/// <summary>
/// 质量压缩比，保存在不同一路径
/// </summary>
/// <param name="sourceFile">原始图片文件</param>
/// <param name="quality">质量压缩比</param>
/// <returns>成功返回true,失败则返回false</returns>
public bool ImageByQuality(String sourceFile, int quality, String outputFile)
{
bool flag = false;
try
{
flag = ThumImageByQuality(sourceFile, quality, outputFile);
}
catch
{
flag = false;
}
return flag;
}
/// <summary>
/// 按质量压缩比压缩图片，保存在同一路径
/// </summary>
/// <param name="sourceFile">原始图片文件</param>
/// <param name="quality">质量压缩比</param>
/// <returns>成功返回true,失败则返回false</returns>
public bool ImageByQuality(String sourceFile, int quality)
{
bool flag = false;
try
{
//如果图像小于300K，不进行压缩
FileInfo firstFileInfo = new FileInfo(sourceFile);
if (firstFileInfo.Length < 300 * 1024)
{
return flag;
}
flag = ThumImageByQuality(sourceFile, quality, sourceFile);
}
catch
{
flag = false;
}
return flag;
}
/// <summary>
/// 按照图片质量生成图片,
/// </summary>
/// <param name="sourceFile">原始图片文件</param>
/// <param name="quality">质量压缩比</param>
/// <param name="outputFile">输出文件名</param>
/// <returns>成功返回true,失败则返回false</returns>
private bool ThumImageByQuality(String sourceFile, long quality, String outputFile)
{
bool flag = false;
try
{
long imageQuality = quality;
Bitmap sourceImage = new Bitmap(sourceFile);
//如果图片宽度小于2000，不进行压缩
if (sourceImage.Width < 2000)
{
return flag;
}
ImageCodecInfo myImageCodecInfo = GetEncoderInfo("image/jpeg");
System.Drawing.Imaging.Encoder myEncoder = System.Drawing.Imaging.Encoder.Quality;
Encoderparameters myEncoderParameters = new EncoderParameters(1);
EncoderParameter myEncoderParameter = new EncoderParameter(myEncoder, imageQuality);
myEncoderParameters.Param[0] = myEncoderParameter;
double xWidth = sourceImage.Width /3.5;
double yWidth = sourceImage.Height / 3.5;
Bitmap newImage = new Bitmap((int)(xWidth), (int)(yWidth));
Graphics g = Graphics.FromImage(newImage);
g.DrawImage(sourceImage, 0, 0, (int)xWidth, (int)yWidth);
sourceImage.Dispose();
g.Dispose();
newImage.Save(outputFile, myImageCodecInfo, myEncoderParameters);
flag = true;
}
catch
{
flag = false;
}
return flag;
}
#region 调用图片处理具体方法
/// <summary>
/// 生成缩略图
/// </summary>
/// <param name="sourceFile">原始图片文件</param>
/// <param name="quality">质量压缩比</param>
/// <param name="multiple">收缩倍数</param>
/// <param name="outputFile">输出文件名</param>
/// <returns>成功返回true,失败则返回false</returns>
private bool ThumImage(String sourceFile, long quality, int multiple, String outputFile)
{
bool flag = false;
try
{
long imageQuality = quality;
Bitmap sourceImage = new Bitmap(sourceFile);
ImageCodecInfo myImageCodecInfo = GetEncoderInfo("image/jpeg");
System.Drawing.Imaging.Encoder myEncoder = System.Drawing.Imaging.Encoder.Quality;
EncoderParameters myEncoderParameters = new EncoderParameters(1);
EncoderParameter myEncoderParameter = new EncoderParameter(myEncoder, imageQuality);
myEncoderParameters.Param[0] = myEncoderParameter;
float xWidth = sourceImage.Width;
float yWidth = sourceImage.Height;
Bitmap newImage = new Bitmap((int)(xWidth / multiple), (int)(yWidth / multiple));
Graphics g = Graphics.FromImage(newImage);
g.DrawImage(sourceImage, 0, 0, xWidth / multiple, yWidth / multiple);
sourceImage.Dispose();
g.Dispose();
newImage.Save(outputFile, myImageCodecInfo, myEncoderParameters);
flag = true;
}
catch
{
flag = false;
}
return flag;
}
/// <summary>
/// 按图片尺寸大小压缩图片
/// </summary>
/// <param name="sourceFile">原始图片文件</param>
/// <param name="multiple">收缩倍数</param>
/// <param name="outputFile">输出文件名</param>
/// <returns>成功返回true,失败则返回false</returns>
public bool ThumImageByMultiple(String sourceFile, int multiple, String outputFile)
{
try
{
Bitmap sourceImage = new Bitmap(sourceFile);
ImageCodecInfo myImageCodecInfo = GetEncoderInfo("image/jpeg");
float xWidth = sourceImage.Width;
float yWidth = sourceImage.Height;
Bitmap newImage = new Bitmap((int)(xWidth / multiple), (int)(yWidth / multiple));
Graphics g = Graphics.FromImage(newImage);
g.DrawImage(sourceImage, 0, 0, xWidth / multiple, yWidth / multiple);
sourceImage.Dispose();
g.Dispose();
newImage.Save(outputFile);
return true;
}
catch
{
return false;
}
}
/// <summary>
/// 按图片尺寸大小压缩图片
/// </summary>
/// <param name="sourceFile">原始图片文件</param>
/// <param name="multiple">收缩倍数</param>
/// <param name="outputFile">输出文件名</param>
/// <returns>成功返回true,失败则返回false</returns>
public bool FixSize(String sourceFile, int xWidth, int yWidth, String outputFile)
{
try
{
Bitmap sourceImage = new Bitmap(sourceFile);
ImageCodecInfo myImageCodecInfo = GetEncoderInfo("image/jpeg");
Bitmap newImage = new Bitmap((int)(xWidth), (int)(yWidth));
Graphics g = Graphics.FromImage(newImage);
g.DrawImage(sourceImage, 0, 0, xWidth, yWidth);
sourceImage.Dispose();
g.Dispose();
newImage.Save(outputFile);
return true;
}
catch
{
return false;
}
}
#endregion getThumImage
/// <summary>
/// 获取图片编码信息
/// </summary>
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;
}
}
}
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