What are potential pitfalls when resizing images in PHP, especially when dealing with aspect ratios?

When resizing images in PHP, a potential pitfall is distorting the aspect ratio of the image, resulting in stretched or squished images. To maintain the aspect ratio, it is important to calculate the new dimensions proportionally based on the original image's aspect ratio. 

// Set the desired width and height for the resized image
$desired_width = 300;
$desired_height = 200;

// Get the original image dimensions
$original_width = imagesx($original_image);
$original_height = imagesy($original_image);

// Calculate new dimensions while maintaining aspect ratio
if ($original_width > $original_height) {
    $new_width = $desired_width;
    $new_height = floor($original_height * ($desired_width / $original_width));
} else {
    $new_height = $desired_height;
    $new_width = floor($original_width * ($desired_height / $original_height));
}

// Create a new image with the calculated dimensions
$resized_image = imagecreatetruecolor($new_width, $new_height);

// Resize the original image to the new dimensions
imagecopyresampled($resized_image, $original_image, 0, 0, 0, 0, $new_width, $new_height, $original_width, $original_height);

// Output or save the resized image

Keywords

GD library imagecopyresampled aspect ratio distortion image quality

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