Convert a bitmap into a byte array

Question

Using C   is there a better way to convert a Windows Bitmap to a byte   than saving to a temporary file and reading the result using a FileStream

User · Answer

Try the following   MemoryStream stream   new MemoryStream    Bitmap bitmap   new Bitmap    bitmap Save stream  ImageFormat Jpeg    byte   byteArray   stream GetBuffer      Make sure you are using   System Drawing  amp  using System Drawing Imaging

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You can also just Marshal Copy the bitmap data   No intermediary memorystream etc  and a fast memory copy   This should work on both 24-bit and 32-bit bitmaps   public static byte   BitmapToByteArray Bitmap bitmap         BitmapData bmpdata   null       try               bmpdata   bitmap LockBits new Rectangle 0  0  bitmap Width  bitmap Height   ImageLockMode ReadOnly  bitmap PixelFormat           int numbytes   bmpdata Stride   bitmap Height          byte   bytedata   new byte numbytes           IntPtr ptr   bmpdata Scan0           Marshal Copy ptr  bytedata  0  numbytes            return bytedata            finally               if  bmpdata    null              bitmap UnlockBits bmpdata

User · Answer

More simple   return  byte   System ComponentModel TypeDescriptor GetConverter pImagen  ConvertTo pImagen  typeof byte

User · Answer

A MemoryStream can be helpful for this   You could put it in an extension method   public static class ImageExtensions       public static byte   ToByteArray this Image image  ImageFormat format                using MemoryStream ms   new MemoryStream                          image Save ms  format               return ms ToArray                        You could just use it like   var image   new Bitmap 10  10      Draw your image byte   arr   image ToByteArray ImageFormat Bmp       I partially disagree with prestomanifto s answer in regards to the ImageConverter   Do not use ImageConverter   There s nothing technically wrong with it  but simply the fact that it uses boxing unboxing from object tells me it s code from the old dark places of the  NET framework and its not ideal to use with image processing  it s overkill for converting to a byte   at least   especially when you consider the following   I took a look at the ImageConverter code used by the  Net framework  and internally it uses code almost identical to the one I provided above   It creates a new MemoryStream  saves the Bitmap in whatever format it was in when you provided it  and returns the array   Skip the extra overhead of creating an ImageConverter class by using MemoryStream

User · Answer

I believe you may simply do   ImageConverter converter   new ImageConverter    var bytes    byte   converter ConvertTo img  typeof byte

User · Answer

There are a couple ways   ImageConverter  public static byte   ImageToByte Image img        ImageConverter converter   new ImageConverter        return  byte   converter ConvertTo img  typeof byte          This one is convenient because it doesn t require a lot of code   Memory Stream  public static byte   ImageToByte2 Image img        using  var stream   new MemoryStream                  img Save stream  System Drawing Imaging ImageFormat Png           return stream ToArray              This one is equivalent to what you are doing  except the file is saved to memory instead of to disk  Although more code you have the option of ImageFormat and it can be easily modified between saving to memory or disk   Source  http   www vcskicks com image-to-byte php

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MemoryStream ms   new MemoryStream    yourBitmap Save ms  ImageFormat Bmp   byte   bitmapData   ms ToArray

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Use a MemoryStream instead of a FileStream  like this   MemoryStream ms   new MemoryStream    bmp Save  ms  ImageFormat Jpeg   byte   bmpBytes   ms ToArray

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Very simple use this just in one line   byte   imgdata   File ReadAllBytes   C  download png

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Save the Image to a MemoryStream and then grab the byte array   http   msdn microsoft com en-us library ms142148 aspx    Byte   data     using  var memoryStream   new MemoryStream            image Save memoryStream  ImageFormat Bmp        data   memoryStream ToArray

[c#] Convert a bitmap into a byte array

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