Resizing images

Resizing images dynamically to a specific proportion can actually be very strange. A standard configuration is not needed, but a array of parameters is required. It can simply be done like this.

$this->load->library('image_lib');

$config = array(
    'image_library' => 'gd2',
    'source_image' => '/absolute/path/to/image.png',
    'new_image' => '/absolute/path/to/new/image.png',
    'maintain_ratio' => true,
    'height' => 920,
    'width' => 9999999999 // simulate infinity
);

$this->image_lib->initialize($config);
if (!$this->image_lib->resize())
    exit('GD2 does not seem to be configured correctly');

$this->image_lib->clear();

• Given the above code, use 999999999999999 to simulate infinity on the dimension you want to dynamically scale to the ratio of the other dimension.
• If you're resizing multiple photos, you need to make sure you're clearing the image library or it'll retain the original source_image and new_image configuration.
• http://ellislab.com/codeigniter/user-guide/libraries/image_lib.html