Use the library as an image resizer?

Hello,

I let my users change their profile image via the camera gallery and device. Since the upload is directly done to Azure (without transiting by our servers) I need to resize images on the client side.

According to the docs, the Downsampling properties are resizing the image to consume less memory. And since there is a GetImageAsJpgAsync(), I thought that I could use a non-displayed CachedImage to resize the camera image :

var downsampledImage = new CachedImage {
    Source = ImageSource.FromStream(() => media.GetStream()),
    DownsampleHeight = 128
};

var jpgBytes = await downsampledImage.GetImageAsJpgAsync(); // exception occurs here

await blockBlob.UploadFromByteArrayAsync(jpgBytes, 0, jpgBytes.Length);

But I get a not-so-helpful NullReferenceException on the GetImageAsJpgAsync line. I think the error comes from the library? Am I using it bad?

[daniel-luberda]

Yes, it has to be rendered. Other operations are better suited for other dedicated libraries like https://github.com/JimBobSquarePants/ImageProcessor and others

[SarathVee]

I’m developing Xamarin mobile application so for i need capture image and performing Auto edge detection on Image also giving image enhancement like Lightning the Cropped image,any help to complete it.