What are some common reasons for poor image quality when using PHP for image processing?

One common reason for poor image quality when using PHP for image processing is using a low-quality compression setting. To improve image quality, you can adjust the compression level to a higher value. Another reason could be incorrect image resizing techniques, which can result in distortion or blurriness. Make sure to use proper resizing algorithms to maintain image clarity.

// Adjust compression level for better image quality
$image = imagecreatefromjpeg('input.jpg');
imagejpeg($image, 'output.jpg', 90); // 90 is the compression level (0-100)

// Use proper resizing techniques
$source = imagecreatefromjpeg('input.jpg');
$width = imagesx($source);
$height = imagesy($source);
$target = imagecreatetruecolor(200, 200);
imagecopyresampled($target, $source, 0, 0, 0, 0, 200, 200, $width, $height);
imagejpeg($target, 'output.jpg');