Codeigniter image resize?

Question

I have problem with image class in CI?

This is example

On controller:

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

O

Answer 1

If the destination image contains a different aspect ratio than the source image, then the source image will be cropped in the same ratio of the destination image have.

public function resize_image($image_data){
$this->load->library('image_lib');
$w = $image_data['image_width']; // original image's width
$h = $image_data['image_height']; // original images's height

$n_w = 273; // destination image's width
$n_h = 246; // destination image's height

$source_ratio = $w / $h;
$new_ratio = $n_w / $n_h;
if($source_ratio != $new_ratio){

    $config['image_library'] = 'gd2';
    $config['source_image'] = './uploads/uploaded_image.jpg';
    $config['maintain_ratio'] = FALSE;
    if($new_ratio > $source_ratio || (($new_ratio == 1) && ($source_ratio < 1))){
        $config['width'] = $w;
        $config['height'] = round($w/$new_ratio);
        $config['y_axis'] = round(($h - $config['height'])/2);
        $config['x_axis'] = 0;

    } else {

        $config['width'] = round($h * $new_ratio);
        $config['height'] = $h;
        $size_config['x_axis'] = round(($w - $config['width'])/2);
        $size_config['y_axis'] = 0;

    }

    $this->image_lib->initialize($config);
    $this->image_lib->crop();
    $this->image_lib->clear();
}
$config['image_library'] = 'gd2';
$config['source_image'] = './uploads/uploaded_image.jpg';
$config['new_image'] = './uploads/new/resized_image.jpg';
$config['maintain_ratio'] = TRUE;
$config['width'] = $n_w;
$config['height'] = $n_h;
$this->image_lib->initialize($config);

if (!$this->image_lib->resize()){

    echo $this->image_lib->display_errors();

} else {

    echo "done";

}}

I have prepared a step by step guide on how to resize image in codeigniter without loosing quality