C# 降低图片的质量

        /// <summary>        /// 压缩图片        /// </summary>        /// <param name="filePath">要压缩的图片的路径</param>        /// <param name="newfilePath">压缩后的图片的路径</param>        public void ChangeImageSize(string filePath, string newfilePath)        {            Bitmap bmp = null;            ImageCodecInfo ici = null;            System.Drawing.Imaging.Encoder ecd = null;            EncoderParameter ept = null;            EncoderParameters eptS = null;            try            {                bmp = new Bitmap(filePath);                ici = this.getImageCoderInfo("image/jpeg");                ecd = System.Drawing.Imaging.Encoder.Quality;                eptS = new EncoderParameters(1);                ept = new EncoderParameter(ecd, 80L);                eptS.Param[0] = ept;                bmp.Save(newfilePath, ici, eptS);            }            catch (Exception ex)            {                throw new Exception(ex.Message);            }            finally            {                bmp.Dispose();                ept.Dispose();                eptS.Dispose();            }        }

        /// <summary>        /// 获取图片编码类型信息        /// </summary>        /// <param name="coderType">编码类型</param>        /// <returns>ImageCodecInfo</returns>        private ImageCodecInfo getImageCoderInfo(string coderType)        {            ImageCodecInfo[] iciS = ImageCodecInfo.GetImageEncoders();            ImageCodecInfo retIci = null;            foreach (ImageCodecInfo ici in iciS)            {                if (ici.MimeType.Equals(coderType))                    retIci = ici;            }            return retIci;        }

转载于:https://www.cnblogs.com/ybb521/p/3392375.html

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