PHP图像魔术师图像没有正确调整大小

Question

So I was adding some image upload functionality to my website and I decided to go with the PHP Image Magician Library by Jarrod Oberto

Resizing a 1080 pixel wide image to 480 pixels works like a charm. However resizing the image to 720 pixels results in an unexpected crop.

Whatever shall I do to make the 720 pixel image resize perfectly?

The code Im using for he resize is;

    <?php
    $magicianObj = new imageLib("original.jpg");
    $magicianObj -> resizeImage(480, 800);
    $magicianObj -> saveImage("480.jpg", 100);
    $magicianObj -> resizeImage(720, 1280);
    $magicianObj -> saveImage("720.jpg", 100);

Here are the images:

1. 480 pixels

1. 720 pixels

Answer 1

Does it make any difference if you resize firstly to 720 and save it then resize to 480 and save?

$magicianObj = new imageLib("original.jpg");
$magicianObj -> resizeImage(720, 1280);
$magicianObj -> saveImage("720.jpg", 100);

$magicianObj -> resizeImage(480, 800);
$magicianObj -> saveImage("480.jpg", 100);