terriblememory

var bgraBuffer = new byte[256 * 256 * 4];
// whatever you need to do to populate the image buffer
var sbm = SoftwareBitmap.CreateCopyFromBuffer(bgraBuffer.AsBuffer(), BitmapPixelFormat.Bgra8, 256, 256, BitmapAlphaMode.Premultiplied);
var sbms = new SoftwareBitmapSource();
var ignore_this_task_it_doesnt_matter = sbms.SetBitmapAsync(sbm);
// SetBitmapAsync may still be in flight but it doesn't matter
var image = Image();
image.Source = sbms;

terriblememory

Disk Utility croaks when you try to do it from the UI but this command line works...

Replace G3X1.dmg with whatever it should be and get the device from DU.

asr imagescan --source ~/Documents/G3X1.dmg
sudo asr restore --source ~/Documents/G3X1.dmg --target /dev/disk-GET-THIS-FROM-DISK-UTILITY --erase