What are some potential pitfalls to be aware of when trying to generate proportional thumbnails in PHP?

One potential pitfall when generating proportional thumbnails in PHP is not maintaining the aspect ratio of the original image, resulting in distorted thumbnails. To avoid this, calculate the proportional dimensions based on the original image's aspect ratio before resizing. 

// Calculate proportional dimensions for thumbnail
$originalWidth = 800;
$originalHeight = 600;
$thumbnailWidth = 200;
$thumbnailHeight = round($originalHeight * ($thumbnailWidth / $originalWidth));

// Create thumbnail image
$originalImage = imagecreatefromjpeg('original.jpg');
$thumbnailImage = imagecreatetruecolor($thumbnailWidth, $thumbnailHeight);
imagecopyresampled($thumbnailImage, $originalImage, 0, 0, 0, 0, $thumbnailWidth, $thumbnailHeight, $originalWidth, $originalHeight);

// Output thumbnail image
header('Content-type: image/jpeg');
imagejpeg($thumbnailImage);

Keywords

image resizing aspect ratio GD library image distortion thumbnail generation

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