网上有很多人都记录以下方法进行转换，这个方法存在一个问题，就是低效，我在进行图片拼接时，图片大了之后就会很慢。所以我有找了一个高效的替代方法。
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public BitmapImage BitmapToBitmapImage(System.Drawing.Bitmap bitmap) { System.Drawing.Bitmap bitmapSource = new System.Drawing.Bitmap(bitmap.Width, bitmap.Height); int i, j; for (i = 0; i < bitmap.Width; i++) for (j = 0; j < bitmap.Height; j++) { System.Drawing.Color pixelColor = bitmap.GetPixel(i, j); System.Drawing.Color newColor = System.Drawing.Color.FromArgb(pixelColor.R, pixelColor.G, pixelColor.B); bitmapSource.SetPixel(i, j, newColor); } MemoryStream ms = new MemoryStream(); bitmapSource.Save(ms, System.Drawing.Imaging.ImageFormat.Bmp); BitmapImage bitmapImage = new BitmapImage(); bitmapImage.BeginInit(); bitmapImage.StreamSource = new MemoryStream(ms.ToArray()); bitmapImage.EndInit(); return bitmapImage; } |
这种方法快多了。赶紧快去试试吧：
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public BitmapImage ToBitmapImage(System.Drawing.Bitmap ImageOriginal) { System.Drawing.Bitmap ImageOriginalBase = new System.Drawing.Bitmap(ImageOriginal); BitmapImage bitmapImage = new BitmapImage(); using (System.IO.MemoryStream ms = new System.IO.MemoryStream()) { ImageOriginalBase.Save(ms, System.Drawing.Imaging.ImageFormat.Png); bitmapImage.BeginInit(); bitmapImage.StreamSource = ms; bitmapImage.CacheOption = BitmapCacheOption.OnLoad; bitmapImage.EndInit(); bitmapImage.Freeze(); } return bitmapImage; } |
补：C# Byte[]、Image、Bitmap 之间的相互转换
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/// <summary> /// 将图片Image转换成Byte[] /// </summary> /// <param name="Image">image对象</param> /// <param name="imageFormat">后缀名</param> /// <returns></returns> public static byte[] ImageToBytes(Image Image, System.Drawing.Imaging.ImageFormat imageFormat) { if (Image == null) { return null; } byte[] data = http://www.cnblogs.com/peasana/archive/2012/02/13/null; using (MemoryStream ms= new MemoryStream()) { using (Bitmap Bitmap = new Bitmap(Image)) { Bitmap.Save(ms, imageFormat); ms.Position = 0; data = http://www.cnblogs.com/peasana/archive/2012/02/13/new byte[ms.Length]; ms.Read(data, 0, Convert.ToInt32(ms.Length)); ms.Flush(); } } return data; } /// <summary> /// byte[]转换成Image /// </summary> /// <param name="byteArrayIn">二进制图片流</param> /// <returns>Image</returns> public static System.Drawing.Image byteArrayToImage(byte[] byteArrayIn) { if (byteArrayIn == null) return null; using (System.IO.MemoryStream ms = new System.IO.MemoryStream(byteArrayIn)) { System.Drawing.Image returnImage = System.Drawing.Image.FromStream(ms); ms.Flush(); return returnImage; } } //Image转换Bitmap 1. Bitmap img = new Bitmap(imgSelect.Image); 2. Bitmap bmp = (Bitmap)pictureBox1.Image; //Bitmap转换成Image using System.IO; private static System.Windows.Controls.Image Bitmap2Image(System.Drawing.Bitmap Bi) { MemoryStream ms = new MemoryStream(); Bi.Save(ms, System.Drawing.Imaging.ImageFormat.Png); BitmapImage bImage = new BitmapImage(); bImage.BeginInit(); bImage.StreamSource = new MemoryStream(ms.ToArray()); bImage.EndInit(); ms.Dispose(); Bi.Dispose(); System.Windows.Controls.Image i = new System.Windows.Controls.Image(); i.Source = bImage; return i ; } //byte[] 转换 Bitmap public static Bitmap BytesToBitmap(byte[] Bytes) { MemoryStream stream = null; try { stream = new MemoryStream(Bytes); return new Bitmap((Image)new Bitmap(stream)); } catch (ArgumentNullException ex) { throw ex; } catch (ArgumentException ex) { throw ex; } finally { stream.Close(); } } //Bitmap转byte[] public static byte[] BitmapToBytes(Bitmap Bitmap) { MemoryStream ms = null; try { ms = new MemoryStream(); Bitmap.Save(ms, Bitmap.RawFormat); byte[] byteImage = new Byte[ms.Length]; byteImage = ms.ToArray(); return byteImage; } catch (ArgumentNullException ex) { throw ex; } finally { ms.Close(); } } } |
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原文链接：https://blog.csdn.net/chulijun3107/article/details/114402665
