title: How can I read (from disk) and resize an image, in Flutter/Dart
body: <p>In Flutter/Dart, how can I perform the following 3 steps:</p>
  
  <ol>
  <li>Read an image from disk,  </li>
  <li>Read its original dimensions (width and height),  </li>
  <li>Resize it.</li>
  </ol>
  
  <p>Note: I must be able to display the final result with a regular Flutter Image widget.</p>
  
  <p><strong>CLARIFICATION:</strong> I don't want to save the image, but I do want to actually resize it in memory.</p>