Convert and blur an uploaded image in PHP with Imagick

Question

I'm very new to PHP and this is the very first time I've tried to use Imagick, so there must be plenty wrong with the script I wrote in order to achieve my goal. :-)

What I'd like to do:

Convert an image that was uploaded to JPEG and resize it;
Make a blurred version of it;
Move the two images to a certain directory.

I wrote a function that's supposed to do it, but, as you guessed, it doesn't do anything at all:

function convertAndBlur($inputIMG, $dst, $width, $quality) {
   $img = new Imagick($inputIMG);
   $img->scaleImage($width, 0, true); // keep aspect ratio
   $img->setImageFormat('jpeg');
   $img->setImageCompressionQuality($quality);
   $img->writeImage($dst . ".jpg");

   $imgBlur = new Imagick($img);
   $imgBlur->blurImage(5,3);

   $imgBlur->writeImage($dst . "_blur.jpg");

   $img->clear(); $img->destroy();
   $imgBlur->clear(); $imgBlur->destroy(); 
}

The function is called this way:

$picture = $_FILES["picture"]["tmp_name"];
$pictureName = "foo";

if(!is_image($picture)) { die("not an image"); }

$picturePath = "uploads/" . $pictureName;

convertAndBlur($picture, $picturePath, 1000, 90);

This will certainly make some of you roll their eyes, but again, that's completely uncharted territory to me. Could anyone help me out? Thanks!

Were any error messages displayed? First that caught my eye was a missing `)` in the line `if(!is_image($picture)) { die("not an image"; }`. — George Brighton, Apr 15 '14 at 20:18
My bad, that's a typo. It isn't missing in the actual code. :-) No error message, the script just doesn't do anything. — Robert S., Apr 15 '14 at 20:24
I can spot several things to look at (e.g. `is_image()` isn't a function, and I'm not sure `Imagick`'s constructor can accept an instance of itself), but your life will be much easier if error reporting is enabled. Have a look at [this answer](http://stackoverflow.com/a/6575502/2765666). — George Brighton, Apr 15 '14 at 20:28
`is_image()` is a custom function I made earlier. I enabled error reporting and it seems that you were right : `Can not process empty Imagick object` on line `$imgBlur->blurImage(5,3);` . How can I then process the same image to get two different versions? :-/ Thank you! — Robert S., Apr 15 '14 at 20:54
Given that `Imagick` will complain if you don't give it an image, I wouldn't bother checking beforehand. How about reading directly from `$inputIMG` again? — George Brighton, Apr 15 '14 at 20:58
It certainly works! :-) I was hoping I could speed up the process a bit by not repeating the same editings. — Robert S., Apr 15 '14 at 21:14

score 2 · Accepted Answer · answered Apr 15 '14 at 21:20

Imagick's constructor cannot take an instance of Imagick as an argument. To create another object, try $imgBlur = clone $img; in place of $imgBlur = new Imagick($img);, which will create a carbon copy of $img. Read more about cloning Imagick objects here.

Convert and blur an uploaded image in PHP with Imagick

1 Answers1