#region Using Directives using System; using System.Web; using System.Drawing; using System.Drawing.Imaging; using System.Drawing.Drawing2D; #endregion Using Directives public class ImageResizer { #region Fields static HttpServerUtility Server = HttpContext.Current.Server; #endregion Fields #region Get Encoder public static ImageCodecInfo GetEncoder(string mimeType) { foreach (ImageCodecInfo codec in ImageCodecInfo.GetImageEncoders()) { if (codec.MimeType == mimeType) { return codec; } } return null; } #endregion Get Encoder #region Resize Image public static void ResizeImage(string originalImageLocation, int width, int height, string newImageLocation) { Image originalImage = Image.FromFile( Server.MapPath(originalImageLocation.Replace("//", "/"))); ResizeImage(originalImage, width, height, newImageLocation); } public static void ResizeImage(Image originalImage, int width, int height, string newImageLocation) { decimal newWidth; decimal newHeight; if ((originalImage.Width / width) > (originalImage.Width / height)) { newWidth = width; newHeight = (Int32)Math.Ceiling(Convert.ToDecimal(( originalImage.Height * newWidth) / originalImage.Width)); if (newHeight > height) { newWidth = newWidth * (height / newHeight); newHeight = height; } } else { newHeight = height; newWidth = Math.Ceiling(Convert.ToDecimal(( originalImage.Width * newHeight) / originalImage.Height)); if (newWidth > width) { newHeight = newHeight * (width / newWidth); newWidth = width; } } Bitmap newBitmap = new Bitmap(Convert.ToInt32(newWidth), Convert.ToInt32(newHeight), PixelFormat.Format16bppRgb565); Graphics g = Graphics.FromImage(newBitmap); g.InterpolationMode = InterpolationMode.HighQualityBicubic; g.SmoothingMode = SmoothingMode.AntiAlias; g.SmoothingMode = SmoothingMode.HighQuality; g.DrawImage(originalImage, 0, 0, Convert.ToInt32(newWidth), Convert.ToInt32(newHeight)); ImageCodecInfo codecEncoder = ImageResizer.GetEncoder("image/jpeg"); int quality = 98; EncoderParameters encodeParams = new EncoderParameters(1); EncoderParameter qualityParam = new EncoderParameter(Encoder.Quality, quality); encodeParams.Param[0] = qualityParam; newBitmap.SetResolution(72, 72); newBitmap.Save(Server.MapPath(newImageLocation), codecEncoder, encodeParams); g.Dispose(); newBitmap.Dispose(); originalImage.Dispose(); } #endregion Resize Image }
posted on
2009-12-24 14:09
老枪
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