How to compress image byte[] array to JPEG/PNG and return ImageSource object

问题:

I have an image (in the form of a byte[] array) and I want to get a compressed version of it. Either a PNG or JPEG compressed version.

I use the following code at the minute:

private Media.ImageSource GetImage(byte[] imageData, System.Windows.Media.PixelFormat format, int width = 640, int height = 480) {      return System.Windows.Media.Imaging.BitmapSource.Create(width, height, 96, 96, format, null, imageData, width * format.BitsPerPixel / 8); } 

How do I extend this so that I can compress and return the compressed version of image source (with the degraded quality).

Thanks in advance!

回答1:

Using the right encoder like PngBitMapEncoder should work:

private ImageSource GetImage(byte[] imageData, System.Windows.Media.PixelFormat format, int width = 640, int height = 480)     {         using (MemoryStream memoryStream = new MemoryStream())         {             PngBitmapEncoder encoder = new PngBitmapEncoder();                                             encoder.Interlace = PngInterlaceOption.On;             encoder.Frames.Add(BitmapFrame.Create(BitmapSource.Create(width, height, 96, 96, format, null, imageData, width * format.BitsPerPixel / 8)));             encoder.Save(memoryStream);             BitmapImage imageSource = new BitmapImage();             imageSource.BeginInit();             imageSource.StreamSource = memoryStream;             imageSource.EndInit();             return imageSource;         }                 } 

文章来源: How to compress image byte[] array to JPEG/PNG and return ImageSource object