Fastest way to convert Image to Byte array

Question

I am making Remote Desktop sharing application in which I capture an image of the Desktop and Compress it and Send it to the receiver  To compress the image I need to convert it to a byte     Currently I am using this   public byte   imageToByteArray System Drawing Image imageIn        MemoryStream ms   new MemoryStream        imageIn Save ms System Drawing Imaging ImageFormat Gif       return  ms ToArray       public Image byteArrayToImage byte   byteArrayIn         MemoryStream ms   new MemoryStream byteArrayIn        Image returnImage   Image FromStream ms        return returnImage      But I don t like it because I have to save it in a ImageFormat and that may also use up resources  Slow Down  as well as produce different compression results I have read on using Marshal Copy and memcpy but I am unable to understand them   So is there any other method to achieve this goal

User · Answer

The fastest way i could find out is this    var myArray    byte    new ImageConverter   ConvertTo InputImg  typeof byte        Hope to be useful

User · Answer

There is a RawFormat property of Image parameter which returns the file format of the image  You might try the following      extension method public static byte   imageToByteArray this System Drawing Image image        using var ms   new MemoryStream                  image Save ms  image RawFormat           return ms ToArray

User · Answer

So is there any other method to achieve this goal    No  In order to convert an image to a byte array you have to specify an image format - just as you have to specify an encoding when you convert text to a byte array   If you re worried about compression artefacts  pick a lossless format  If you re worried about CPU resources  pick a format which doesn t bother compressing - just raw ARGB pixels  for example  But of course that will lead to a larger byte array   Note that if you pick a format which does include compression  there s no point in then compressing the byte array afterwards - it s almost certain to have no beneficial effect

User · Answer

I m not sure if you re going to get any huge gains for reasons Jon Skeet pointed out  However  you could try and benchmark the TypeConvert ConvertTo method and see how it compares to using your current method   ImageConverter converter   new ImageConverter    byte   imgArray    byte   converter ConvertTo imageIn  typeof byte

User · Answer

public static byte   ReadImageFile string imageLocation                byte   imageData   null          FileInfo fileInfo   new FileInfo imageLocation           long imageFileLength   fileInfo Length          FileStream fs   new FileStream imageLocation  FileMode Open  FileAccess Read           BinaryReader br   new BinaryReader fs           imageData   br ReadBytes  int imageFileLength           return imageData

User · Answer

public static class HelperExtensions         Convert Image to byte   array      public static byte   ToByteArray this Image imageIn                var ms   new MemoryStream            imageIn Save ms  System Drawing Imaging ImageFormat Png           return ms ToArray                 Convert byte   array to Image      public static Image ToImage this byte   byteArrayIn                var ms   new MemoryStream byteArrayIn           var returnImage   Image FromStream ms           return returnImage

[c#] Fastest way to convert Image to Byte array

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