Converting BitmapImage to Bitmap and vice versa

Question

I have BitmapImage in C   I need to do operations on image  For example grayscaling  adding text on image  etc   I have found function in stackoverflow for grayscaling which accepts Bitmap and returns Bitmap   So I need to convert BitmapImage to Bitmap  do operation and convert back   How can I do this  Is this best way

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I ve just been trying to use the above in my code and I believe that there is a problem with the Bitmap2BitmapImage function  and possibly the other one as well    using  MemoryStream ms   new MemoryStream      Does the above line result in the stream being disposed of  Which means that the returned BitmapImage loses its content   As I m a WPF newbie I m not sure that this is the correct technical explanation  but the code didn t work in my application until I removed the using directive

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Here the async version   public static Task lt BitmapSource gt  ToBitmapSourceAsync this Bitmap bitmap        return Task Run      gt                using  System IO MemoryStream memory   new System IO MemoryStream                          bitmap Save memory  ImageFormat Png               memory Position   0              BitmapImage bitmapImage   new BitmapImage                bitmapImage BeginInit                bitmapImage StreamSource   memory              bitmapImage CacheOption   BitmapCacheOption OnLoad              bitmapImage EndInit                bitmapImage Freeze                return bitmapImage as BitmapSource

User · Answer

If you just need to go from BitmapImage to Bitmap it s quite easy   private Bitmap BitmapImage2Bitmap BitmapImage bitmapImage                return new Bitmap bitmapImage StreamSource

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Here s an extension method for converting a Bitmap to BitmapImage       public static BitmapImage ToBitmapImage this Bitmap bitmap                using  var memory   new MemoryStream                          bitmap Save memory  ImageFormat Png               memory Position   0               var bitmapImage   new BitmapImage                bitmapImage BeginInit                bitmapImage StreamSource   memory              bitmapImage CacheOption   BitmapCacheOption OnLoad              bitmapImage EndInit                bitmapImage Freeze                 return bitmapImage

User · Answer

using System Windows Interop        private BitmapImage Bitmap2BitmapImage Bitmap bitmap                                        BitmapSource i   Imaging CreateBitmapSourceFromHBitmap                             bitmap GetHbitmap                               IntPtr Zero                             Int32Rect Empty                             BitmapSizeOptions FromEmptyOptions                 return  BitmapImage i

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There is no need to use foreign libraries   Convert a BitmapImage to Bitmap   private Bitmap BitmapImage2Bitmap BitmapImage bitmapImage           BitmapImage bitmapImage   new BitmapImage new Uri     Images test png   UriKind Relative         using MemoryStream outStream   new MemoryStream                  BitmapEncoder enc   new BmpBitmapEncoder            enc Frames Add BitmapFrame Create bitmapImage            enc Save outStream           System Drawing Bitmap bitmap   new System Drawing Bitmap outStream            return new Bitmap bitmap             To convert the Bitmap back to a BitmapImage    System Runtime InteropServices DllImport  gdi32 dll    public static extern bool DeleteObject IntPtr hObject    private BitmapImage Bitmap2BitmapImage Bitmap bitmap        IntPtr hBitmap   bitmap GetHbitmap        BitmapImage retval       try               retval    BitmapImage Imaging CreateBitmapSourceFromHBitmap                       hBitmap                       IntPtr Zero                       Int32Rect Empty                       BitmapSizeOptions FromEmptyOptions               finally               DeleteObject hBitmap              return retval

User · Answer

Thanks Guillermo Hernandez  I created a variation of your code that works  I added the namespaces in this code for reference   System Reflection Assembly theAsm   Assembly LoadFrom  My dll       Get a stream to the embedded resource System IO Stream stream   theAsm GetManifestResourceStream   picture png        Here is the most important part  System Windows Media Imaging BitmapImage bmi   new BitmapImage    bmi BeginInit    bmi StreamSource   stream  bmi EndInit

User · Answer

This converts from System Drawing Bitmap to BitmapImage   MemoryStream ms   new MemoryStream    YOURBITMAP Save ms  System Drawing Imaging ImageFormat Bmp   BitmapImage image   new BitmapImage    image BeginInit    ms Seek 0  SeekOrigin Begin   image StreamSource   ms  image EndInit

[c#] Converting BitmapImage to Bitmap and vice versa

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