Resizing an image using imagemagick

[Giddy Rob]

Hi,

 

I am a little stuck as I need to resize an image then get the width and height for a record in my database.

 

What I am basically trying to do is have a set of three constraints for the size or a custom size the user can set. For example if one option says"400 height || 400 width" then the width or the height will be set to a maximum of 400px, depending on the which is the largest (keeping aspect ratio). The custom just allows them to set the width and height themselves.

 

It was previously done with this command below, but the system has now moved servers so it doesn't work anymore as I don't think I have permission to use the system call.

 

   if ($_POST['picsize'] == 'S') {$_POST['maxwidth']=100;$_POST['maxheight']=100;}
   if ($_POST['picsize'] == 'M') {$_POST['maxwidth']=250;$_POST['maxheight']=250;}
   if ($_POST['picsize'] == 'L') {$_POST['maxwidth']=400;$_POST['maxheight']=400;}
   if ($_POST['maxwidth'] > 0 && $_POST['maxheight'] > 0) {
    system("/usr/local/bin/convert -quality 80 -thumbnail {$_POST['maxwidth']}x{$_POST['maxheight']}\\> \"{$_FILES['ins_image']['tmp_name']}\" \"../news_images/{$_FILES['ins_image']['name']}\"");
}

 

I would like to do this with imagemagick if possible.

 

Any help would be great

 

Cheers in advance

 

Rob Shillito