// So in this case we want to write PNG but file should come out
// as JPEG
$fp = fopen(PNG_FILE, "w+");
$im->readImage(JPEG_FILE);
$im->setImageFormat('png');
$im->writeImageFile($fp);
$im->clear();
fclose($fp);
// Output the format
$identify = new Imagick(PNG_FILE);
echo $identify->getImageFormat() . PHP_EOL;
// Lets try again, setting the filename rather than format
// This should cause PNG image to be written
$fp = fopen(PNG_FILE, "w+");
$im->readImage(JPEG_FILE);
$im->setImageFilename('png:');
$im->writeImageFile($fp);
$im->clear();
fclose($fp);
// If all goes according to plan, on second time we should get PNG
$identify = new Imagick(PNG_FILE);
echo $identify->getImageFormat() . PHP_EOL;
// Lastly, test the newly added format parameter
$fp = fopen(PNG_FILE, "w+");
$im->readImage(JPEG_FILE);
$im->writeImageFile($fp, 'png');
$im->clear();
fclose($fp);
// If all goes according to plan, on second time we should get PNG
$identify = new Imagick(PNG_FILE);
echo $identify->getImageFormat() . PHP_EOL;