C#中图片切割,图片压缩,缩略图生成的代码

8/3/2015来源:C#应用人气:1486

C#中图片切割,图片压缩,缩略图生成的代码
**//// <summary>    /// 图片切割函数    /// </summary>    /// <param name="sourceFile">原始图片文件</param>    /// <param name="xNum">在X轴上的切割数量</param>    /// <param name="yNum">在Y轴上的切割数量</param>    /// <param name="quality">质量压缩比</param>    /// <param name="outputFile">输出文件名,不带后缀</param>    /// <returns>成功返回true,失败则返回false</returns>    public static bool imageCut(String sourceFile, int xNum, int yNum, long quality, String outputFile)    {        try        {            long imageQuality                        =    quality;            Bitmap sourceImage                       =    new Bitmap(sourceFile);            ImageCodecInfo myImageCodecInfo          =    GetEncoderInfo("image/jpeg");            Encoder myEncoder                        =    Encoder.Quality;            EncoderParameters myEncoderParameters    =    new EncoderParameters(1);            EncoderParameter myEncoderParameter      =    new EncoderParameter(myEncoder, imageQuality);            myEncoderParameters.Param[0]             =    myEncoderParameter;            float xWidth                             =    sourceImage.Width / xNum;            float yWidth                             =    sourceImage.Height / yNum;            String outputImage                       =    "";                        for (int countY = 0; countY < yNum; countY++)                for (int countX = 0; countX < xNum; countX++)                {                    RectangleF cloneRect             =    new RectangleF(countX * xWidth, countY * yWidth, xWidth, yWidth);                    Bitmap newImage                  =    sourceImage.Clone(cloneRect, PixelFormat.Format24bpPRgb);                    outputImage                      =    outputFile + countX + countY + ".jpg";                    newImage.Save(outputImage, myImageCodecInfo, myEncoderParameters);                }            return true;        }        catch        {            return false;        }    }    #endregion imageCut    imageCompress#regionimageCompress    /**//// <summary>    /// 图片压缩函数    /// </summary>    /// <param name="sourceFile">原始图片文件</param>    /// <param name="quality">质量压缩比</param>    /// <param name="ouputFile">输出文件名,请用 .jpg 后缀 </param>    /// <returns>成功返回true,失败则返回false</returns>    public static bool imageCompress(String sourceFile,long quality,String outputFile)    {        try        {            long imageQuality                      =    quality;            Bitmap sourceImage                     =    new Bitmap(sourceFile);            ImageCodecInfo myImageCodecInfo        =    GetEncoderInfo("image/jpeg");            Encoder myEncoder                      =    Encoder.Quality;            EncoderParameters myEncoderParameters  =    new EncoderParameters(1);            EncoderParameter myEncoderParameter    =    new EncoderParameter(myEncoder, imageQuality);            myEncoderParameters.Param[0]           =    myEncoderParameter;                       sourceImage.Save(outputFile, myImageCodecInfo, myEncoderParameters);            return true;        }        catch        {            return false;        }    }    #endregion imageCompress    getThumImage#region getThumImage    /**//// <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>    public static bool getThumImage(String sourceFile, long quality, int multiple, String outputFile)    {        try        {            long imageQuality                      =   quality;            Bitmap sourceImage                     =   new Bitmap(sourceFile);            ImageCodecInfo myImageCodecInfo        =   GetEncoderInfo("image/jpeg");            Encoder myEncoder                      =   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);            g.Dispose();            newImage.Save(outputFile,myImageCodecInfo,myEncoderParameters);            return true;        }        catch        {            return false;        }    }    #endregion getThumImage    ImageCodecInfo#region ImageCodecInfo    /**//// <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;    }