這一篇我們呢采用的壓縮方式跟上一篇是一樣的，不同的是，這次我們會同時融入一個等比壓縮寬高的方法，這兩個一起使用，會使文件空間大幅度減小，同時也可以單獨壓縮寬高，質量等級不要變（直接用100即可）；
實現功能：
開發環境：
開發工具：Visual Studio 2013
.NET Framework版本：4.5
實現代碼：
private void btnOld_Click(object sender, EventArgs e) { OpenFileDialog ofd = new OpenFileDialog(); ofd.Filter = "圖片|*.jpg;*.jpeg;*.png"; if (ofd.ShowDialog() == DialogResult.OK) { txtOld.Text = ofd.FileName; } }
private void btnNew_Click(object sender, EventArgs e) { FolderBrowserDialog fbd = new FolderBrowserDialog(); fbd.ShowNewFolderButton = true; if (fbd.ShowDialog() == DialogResult.OK) { txtNew.Text = fbd.selectedPath; } }
private void btnCompressSize_Click(object sender, EventArgs e){ ImgSizeCompress(10L); ImgSizeCompress(50L); ImgSizeCompress(70L); MessageBox.Show("成功");}
private void ImgSizeCompress(long level) { Image img = Image.fromFile(txtOld.Text); ImageFormat imgFormat = img.RawFormat;
Size newSize = new Size(img.Width / 2, img.Height / 2); Bitmap outBmp = new Bitmap(newSize.Width, newSize.Height);
Graphics g = Graphics.fromImage(outBmp); g.CompositingQuality = CompositingQuality.HighQuality; g.SmoothingMode = SmoothingMode.HighQuality; g.InterpolationMode = InterpolationMode.HighQualityBicubic; g.DrawImage(img, new Rectangle(0, 0, newSize.Width, newSize.Height), 0, 0, img.Width, img.Height, GraphicsUnit.Pixel); g.Dispose(); img.Dispose();
EncoderParameters encoderParams = new EncoderParameters(); encoderParams.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, level);
ImageCodecInfo codecInfo = GetEncoder(imgFormat); string savePath = txtNew.Text + "\\" + DateTime.Now.Ticks + "." + codecInfo.FormatDescription; outBmp.Save(savePath, codecInfo, encoderParams); outBmp.Dispose(); }
private ImageCodecInfo GetEncoder(ImageFormat format) { ImageCodecInfo[] codecs = ImageCodecInfo.GetImageEncoders(); foreach (ImageCodecInfo codec in codecs) { if (codec.FormatID == format.Guid) { return codec; } } return null; }
實現效果：
上面是將寬度和高度分別縮小了一半，看得出來，效果還是比較明顯的
該文章在 2023/2/27 10:46:40 編輯過
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