Compress image while uploading

Question

Hi Xperts,

How to compress the image while uploading the xamarin forms.

Answer 1

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How to compress the image while uploading the xamarin forms.

Try to create an 'ImageResizer' control class to resize the image on each platform. Check the code:

   public static class ImageResizer  
   {  
       static ImageResizer()  
       {  
       }  
     
       public static async Task<byte[]> ResizeImage(byte[] imageData, float width, float height)  
       {  
           var platform = Device.RuntimePlatform;  
           switch (platform)  
           {  
               case Device.Android:  
                   return ResizeImageAndroid(imageData, width, height);  
               case Device.iOS:  
                   return ResizeImageIOS(imageData, width, height);  
               default:  
                   break;  
           }  
     
           return null;  
       }  
       public static byte[] ResizeImageAndroid(byte[] imageData, float width, float height)  
       {  
           // Load the bitmap  
           Bitmap originalImage = BitmapFactory.DecodeByteArray(imageData, 0, imageData.Length);  
           Bitmap resizedImage = Bitmap.CreateScaledBitmap(originalImage, (int)width, (int)height, false);  
     
           using (MemoryStream ms = new MemoryStream())  
           {  
               resizedImage.Compress(Bitmap.CompressFormat.Jpeg, 100, ms);  
               return ms.ToArray();  
           }  
       }  
       public static byte[] ResizeImageIOS(byte[] imageData, float width, float height)  
       {  
           UIImage originalImage = ImageFromByteArray(imageData);  
           UIImageOrientation orientation = originalImage.Orientation;  
     
           //create a 24bit RGB image  
           using (CoreGraphics.CGBitmapContext context = new CoreGraphics.CGBitmapContext(IntPtr.Zero,  
                                                (int)width, (int)height, 8,  
                                                4 * (int)width, CoreGraphics.CGColorSpace.CreateDeviceRGB(),  
                                                CoreGraphics.CGImageAlphaInfo.PremultipliedFirst))  
           {  
     
               RectangleF imageRect = new RectangleF(0, 0, width, height);  
     
               // draw the image  
               context.DrawImage(imageRect, originalImage.CGImage);  
     
               UIKit.UIImage resizedImage = UIKit.UIImage.FromImage(context.ToImage(), 0, orientation);  
     
               // save the image as a jpeg  
               return resizedImage.AsJPEG().ToArray();  
           }  
       }  
     
       public static UIKit.UIImage ImageFromByteArray(byte[] data)  
       {  
           if (data == null)  
           {  
               return null;  
           }  
     
           UIKit.UIImage image;  
           try  
           {  
               image = new UIKit.UIImage(Foundation.NSData.FromArray(data));  
           }  
           catch (Exception e)  
           {  
               Console.WriteLine("Image load failed: " + e.Message);  
               return null;  
           }  
           return image;  
       }  
   }  

Here is the related sample: https://learn.microsoft.com/en-us/samples/xamarin/xamarin-forms-samples/xamformsimageresize/

Best Regards,

Jarvan Zhang

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