JPEG vs PNG vs AVIF vs WebP Comparison

results.txt

----
Image: horizon
  Original Size: 212798
  Dimensions: 1000 x 1000 px
  Format: jpeg
    Output size: 164895
  Format: png
    Output size: 1672103
  Format: avif
    Output size: 148628
  Format: webp
    Output size: 123402

----
Image: minit
  Original Size: 147531
  Dimensions: 1000 x 1000 px
  Format: jpeg
    Output size: 123602
  Format: png
    Output size: 595040
  Format: avif
    Output size: 74898
  Format: webp
    Output size: 75006

testimg.php

<?php

$images = [
	'horizon' => 'https://cdn-images.dzcdn.net/images/cover/f0ae18d5eaf49aed9a0ac3d8cf558955/1000x1000-000000-80-0-0.jpg',
	'minit' => 'https://cdn-images.dzcdn.net/images/cover/b6c9a16d838f0d4fc7c5502c55eb628e/1000x1000-000000-80-0-0.jpg'
];

foreach ($images as $name => $url) {
	if (!is_dir($name)) {
		mkdir($name);
	}

	printf("\n----\n");
	printf("Image: %s\n", $name);

	$data = file_get_contents($url);
	file_put_contents("{$name}/original.jpg", $data);
	printf("  Original Size: %d\n", strlen($data));

	$img = imagecreatefromstring($data);
	printf("  Dimensions: %d x %d px\n", imagesx($img), imagesy($img));

	test_formats($name, $img);

	imagedestroy($img);
}

function test_formats(string $name, GdImage $image) {
	foreach (['jpeg', 'png', 'avif', 'webp'] as $format) {
		printf("  Format: %s\n", $format);
		ob_start();
		$params = [$image, null, $format == 'png' ? 9 : 60];
		if ($format == 'avif') {
			$params[] = 0;
		}
		$funcName = "image{$format}";
		call_user_func_array($funcName, $params);
		$result = ob_get_clean();

		printf("    Output size: %d\n", strlen($result));
		file_put_contents("{$name}/result.{$format}", $result);
	}
}