C＃中保存的JPG的质量

下面的代码示例演示如何使用EnprerParameter构造函数创建EnprerParameter。要运行此示例，请粘贴代码并调用

VaryQualityLevel

本示例需要位于c：的名为TestPhoto.jpg的图像文件。

private void VaryQualityLevel(){    // Get a bitmap.    Bitmap bmp1 = new Bitmap(@"c:TestPhoto.jpg");    ImageCodecInfo jgpEnprer = GetEnprer(ImageFormat.Jpeg);    // Create an Enprer object based on the GUID    // for the Quality parameter category.    System.Drawing.Imaging.Enprer myEnprer =        System.Drawing.Imaging.Enprer.Quality;    // Create an EnprerParameters object.    // An EnprerParameters object has an array of EnprerParameter    // objects. In this case, there is only one    // EnprerParameter object in the array.    EnprerParameters myEnprerParameters = new EnprerParameters(1);    EnprerParameter myEnprerParameter = new EnprerParameter(myEnprer,         50L);    myEnprerParameters.Param[0] = myEnprerParameter;    bmp1.Save(@"c:TestPhotoQualityFifty.jpg", jgpEnprer,         myEnprerParameters);    myEnprerParameter = new EnprerParameter(myEnprer, 100L);    myEnprerParameters.Param[0] = myEnprerParameter;    bmp1.Save(@"c:TestPhotoQualityHundred.jpg", jgpEnprer,         myEnprerParameters);    // Save the bitmap as a JPG file with zero quality level compression.    myEnprerParameter = new EnprerParameter(myEnprer, 0L);    myEnprerParameters.Param[0] = myEnprerParameter;    bmp1.Save(@"c:TestPhotoQualityZero.jpg", jgpEnprer,         myEnprerParameters);}private ImageCodecInfo GetEnprer(ImageFormat format){    ImageCodecInfo[] precs = ImageCodecInfo.GetImageDeprers();    foreach (ImageCodecInfo prec in precs)    {        if (prec.FormatID == format.Guid)        { return prec;        }    }    return null;}

参考：http :
//msdn.microsoft.com/en-
us/library/system.drawing.imaging.enprerparameter.aspx