imagick-writeimagefile-test.php

<?php

function readInput() {
	$file = 'test.png';

	if (!file_exists($file)) {
		copy('http://upload.wikimedia.org/wikipedia/commons/4/47/PNG_transparency_demonstration_1.png', $file);
	}

	$im = new Imagick();
	$im->readImage($file);

	$im->setImageFormat('JPEG');
	$im->setImageCompression(\Imagick::COMPRESSION_JPEG);

	return $im;
}

// write directly to file with .jpg extension
$im = readInput();
$im->writeImage('test-writeimage.jpg');
// less test-writeimage.jpg:
// test-writeimage.jpg JPEG 800x600 800x600+0+0 8-bit DirectClass 47.7KB 0.000u 0:00.000

// write to file via string
$im = readInput();
file_put_contents('test-getimageblob.jpg', $im->getImageBlob());
// less test-getimageblob.jpg:
// test-getimageblob.jpg JPEG 800x600 800x600+0+0 8-bit DirectClass 47.7KB 0.000u 0:00.000

// write to resource
$im = readInput();
$output = fopen('test-writeimagefile.jpg', 'w');
$im->writeImageFile($output);
// less test-writeimagefile.jpg:
// test-writeimagefile.jpg PNG 800x600 800x600+0+0 8-bit DirectClass 235KB 0.000u 0:00.000