<?php
$imageHelper = Core::make('helper/image');
 
$file = File::getByID($fID);
if (is_object($file)) {
    // getThumbnail($fileObject, maxWidth, maxHeight, crop)
    // - maxWidth and maxHeight are integers - setting them to "9999" effectively means "no maximum size" for that particular dimension
    // - crop set to true will crop the image
    // - crop set to false will not crop the image and preserve its dimension ratio
 
    // getThumbnail() creates an image object with these properties
    // - src
    // - width
    // - height
 
    // Example:
    // the image will not have a maximum width or maximum height
    // the image will not be cropped
    $exampleImage2 = $imageHelper->getThumbnail($file, 9999, 9999, false);
    // Example:
    // the image will have a maximum width of 400px and a maximum height of 400px
    // the image will be cropped to 400px by 400px
    $exampleImage3 = $imageHelper->getThumbnail($file, 400, 400, true);
    // Example:
    // the image will have a maximum width of 300px and a maximum height that maintains the image proportions
    // the image will not be cropped
    $exampleImage4 = $imageHelper->getThumbnail($file, 300, 9999, false);
}