我正在尝试调整图像的大小,同时保留原始图像的长宽比,以使新图像看起来不被挤压。
例如:
将150 * 100的图像转换为150 * 150的图像。 高度的额外50像素需要用白色背景色填充。
这是我正在使用的当前代码。
它可以很好地调整大小,但更改原始图像的纵横比会挤压新图像。
private void resizeImage(string path, string originalFilename, int width, int height) { Image image = Image.FromFile(path + originalFilename); System.Drawing.Image thumbnail = new Bitmap(width, height); System.Drawing.Graphics graphic = System.Drawing.Graphics.FromImage(thumbnail); graphic.InterpolationMode = InterpolationMode.HighQualityBicubic; graphic.SmoothingMode = SmoothingMode.HighQuality; graphic.PixelOffsetMode = PixelOffsetMode.HighQuality; graphic.CompositingQuality = CompositingQuality.HighQuality; graphic.DrawImage(image, 0, 0, width, height); System.Drawing.Imaging.ImageCodecInfo[] info = ImageCodecInfo.GetImageEncoders(); EncoderParameters encoderParameters; encoderParameters = new EncoderParameters(1); encoderParameters.Param[0] = new EncoderParameter(Encoder.Quality, 100L); thumbnail.Save(path + width + "." + originalFilename, info[1], encoderParameters); }
编辑:我想有图像填充而不是裁剪
我从此CodeProject文章中学到了如何调整图像大小和填充图像。
static Image FixedSize(Image imgPhoto, int Width, int Height) { int sourceWidth = imgPhoto.Width; int sourceHeight = imgPhoto.Height; int sourceX = 0; int sourceY = 0; int destX = 0; int destY = 0; float nPercent = 0; float nPercentW = 0; float nPercentH = 0; nPercentW = ((float)Width / (float)sourceWidth); nPercentH = ((float)Height / (float)sourceHeight); if (nPercentH < nPercentW) { nPercent = nPercentH; destX = System.Convert.ToInt16((Width - (sourceWidth * nPercent)) / 2); } else { nPercent = nPercentW; destY = System.Convert.ToInt16((Height - (sourceHeight * nPercent)) / 2); } int destWidth = (int)(sourceWidth * nPercent); int destHeight = (int)(sourceHeight * nPercent); Bitmap bmPhoto = new Bitmap(Width, Height, PixelFormat.Format24bppRgb); bmPhoto.SetResolution(imgPhoto.HorizontalResolution, imgPhoto.VerticalResolution); Graphics grPhoto = Graphics.FromImage(bmPhoto); grPhoto.Clear(Color.Red); grPhoto.InterpolationMode = InterpolationMode.HighQualityBicubic; grPhoto.DrawImage(imgPhoto, new Rectangle(destX, destY, destWidth, destHeight), new Rectangle(sourceX, sourceY, sourceWidth, sourceHeight), GraphicsUnit.Pixel); grPhoto.Dispose(); return bmPhoto; }