I could not find a way to convert TIFF byte array into JPEG byte array in PHP. I tried the following:
$im = imagecreatefromstring("49 49 2a 00 16 1d 00 00 80 3f e0 4f f0 04 16 0d II.........O....07 84 42 61 50 b8 64 36 1d 0f 88 44 62 51 38 a4 ..BaP.d6...DbQ8.56 2d 17 8c 46 63 51 b8 e4 76 3d 1f 90 48 64 52 V...FcQ..v...HdR
39 24 96 4d 27 94 4a 65 52 b9 64 b6 5d 2f 90 c0 9..M..JeR.d.....");
but it returns Data is not recognized format.
So how do I convert TIFF bytes into JPEG bytes?
The GD extension currently does not support loading TIFF images. You can use Imagick extension instead:
try {
$im = new Imagick();
$im->readImageBlob($tiff_bytes);
$im->setFormat('JPEG');
file_put_contents('test.jpeg', $im->getImageBlob());
} catch (Exception $e) {
trigger_error($e->getMessage(), E_USER_ERROR);
}
In the code above, $tiff_bytes is a binary string of a TIFF image.
Alternatively, you can install the official command line tools, save the TIFF image to filesystem, and convert it to JPEG using the following command:
convert file.jpg file.tiff
There is a number of ways to execute a shell command in PHP. I prefer exec() for the cases when I do not need much of control over the execution, and proc_open() when I need full control over the contents of the file descriptors, i.e. in most cases.
phpinfo();, if you are running a Web SAPI, or at the output of php -m (list of loaded modules) in CLI. Have you installed the PECL extension? Is the library present in the extensions directory (extension_dir in php.ini)?
extension_dir, restart the Web server, and check the output of <?php phpinfo();. You may find this page useful
II,M,JeRmean.