how to resize image size(quality) with codeigniter image_lib - php

Question

we are creating an application which allows image upload, now we want to reduce the image size to reduce the page load time, now this is the code i'm using, it doesn't work, image size remains 100% it doesn't reduce, please help maybe i'm missing something or i'm doing something wrong
if(!empty($_FILES['image_field']['name']))
{
$config['upload_path'] = 'image_folder';
$config['allowed_types'] = 'jpg|png';
$config['max_size'] = '262144';
$config['file_name'] = 'my_image_name';
$this->load->library('upload',$config);
if(!$this->upload->do_upload('image_field'))
{
$this->session->set_flashdata('error','<div class="alert alert-warning">Something went wrong...try again...</div>');
redirect('Controller/function_name');
}
else
{
$type = array('image/png'=>'png','image/jpg'=>'jpg','image/jpeg'=>'jpg');
$config['image_library'] = 'gd2';
$config['source_image'] = base_url().'image_folder'.$config['file_name'].'.'.$type[$_FILES['image_field']['type']];
$config['quality'] = '50%';
$this->load->library('image_lib', $config);
$this->image_lib->resize();
// save to database
}
}
i'm using codeigniter 3.0

Answer 1

You should use without % as integer like that:
$config['quality'] = 50;

Answer 2

$config['image_library'] = 'gd2';
$config['quality'] = 60;
works great adjust the quality and check the image file size it save. will be different.

Answer 3

I also had to set my image_library parameter to "gd" before the quality change started working. I wonder why it didn't work with "gd2"
$config['image_library'] = 'gd';
$config['quality'] = 40;

Answer 4

I found this would not work for me using the GD or GD2 library.
In order for the "quality" to be affected - I needed to use the "ImageMagick" Library.
As stated in the documentation - if you use either the "ImageMagick" or the "NetPBM" library - "you must supply the path": https://codeigniter.com/userguide3/libraries/image_lib.html
On my GoDaddy server the path was "/usr/bin"
$config['source_image'] = $source_image;
$config['library_path'] = '/usr/bin';
$config['image_library'] = 'ImageMagick';
$config['maintain_ratio'] = TRUE;
$config['quality'] = "20%"; // Maintained the aspect ratio and dimensions but reduced the file size by about 60%
$this->image_lib->initialize($config);
if(!$this->image_lib->resize()){
echo "QUCKVIEW Re-sizing - ";
echo $this->image_lib->display_errors();
echo "Image Resize for Grooming Quickview Failed! Contact System Administrator.";
die();
}