如何縮小圖像尺寸

Question

我試圖減小從相機拍攝的圖像的大小，然后再將其保存到隔離存儲中。 我已經將其降低到最低分辨率（640x480）。如何將字節減少到100kb，而不是將近1mb的字節輸出。

void cam_CaptureImageAvailable(object sender, Microsoft.Devices.ContentReadyEventArgs e)
    {

        string fileName = folderName+"\\MyImage" + savedCounter + ".jpg";

        try
        {   

            // Set the position of the stream back to start
            e.ImageStream.Seek(0, SeekOrigin.Begin);

            // Save picture as JPEG to isolated storage.
            using (IsolatedStorageFile isStore = IsolatedStorageFile.GetUserStoreForApplication())
            {
                using (IsolatedStorageFileStream targetStream = isStore.OpenFile(fileName, FileMode.Create, FileAccess.Write))
                {

                    // Initialize the buffer for 4KB disk pages.
                    byte[] readBuffer = new byte[4096];
                    int bytesRead = -1;

                    // Copy the image to isolated storage. 
                    while ((bytesRead = e.ImageStream.Read(readBuffer, 0, readBuffer.Length)) > 0)
                    {
                        targetStream.Write(readBuffer, 0, bytesRead);
                    }

                }

            }




        }
        finally
        {
            // Close image stream
            e.ImageStream.Close();
        }

    }

Answer 1

我對Windows Phone毫無了解，但也許此鏈接可以為您提供幫助： http : //msdn.microsoft.com/zh-cn/library/ff769549(v=vs.92).aspx

1）加載jpeg 2）復制到位圖3）使用質量設置另存為位圖http://msdn.microsoft.com/zh-cn/library/system.windows.media.imaging.extensions.savejpeg(v=vs。 92）.aspx