resize() not working using Image manipulation class

Question

I’ve been reading the docs and trying everything to make thumbs out of uploaded images but I can’t seem to find the problem.

Images are uploaded and saved correctly but thumbs are not, it fails with no error output. This is the code I’m using:

$data = $this->upload->data();

$config_image['image_library'] = 'gd';
$config_image['source_image'] = $data['full_path'];
$config_image['new_image'] = 'uploads/thumbs/';
$config_image['create_thumb'] = TRUE;
$config_image['maintain_ratio'] = TRUE;
$config_image['width'] = 750;
$this->load->library('image_lib', $config_image);

if ( !$this->image_lib->resize())
{
    $this->session->set_flashdata('message',  $this->image_lib->display_errors());
}

Also, I want to resize images to fit max-width=750, but maintain the ratio. Is what I’m doing correct to achieve that? Thanks!

gvillavizar · Accepted Answer · 2017-12-14 08:57:49Z

2

I know this is a little too late, but I recently had the same issue and solve it by initializing the class.

The CodeIgniter example does not work, you have to load the class first:

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

Then after setting the config you need, then you initialize the class like so:

$this->image_lib->initialize($config);

This worked for me right away.

I'm posting this in case anyone else is having the same issue, so they solve it with CodeIgniter and not another library.

answered Dec 14, 2017 at 8:57

gvillavizar

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Comments

Frunsi · Accepted Answer · 2010-07-11 20:53:14Z

1

Maybe both, width AND height must be specified? Just try it with a fixed height (and do aspect ratio aware scaling in a second step).

For maintaining the ratio, its simple, first compute the aspect ratio of the image, then compute the target height:

$target_width = 750;
$image_aspect_ratio = $image_width / $image_height;
$target_height = $target_width / $image_aspect_ratio;

You can deduce this from simple math: r = w/h. So, w=r*h (=the target width, if you have a fixed height) and h = w/r (=the target height, if you have a fixed width).

answered Jul 11, 2010 at 20:53

Frunsi

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Comments

stef · Accepted Answer · 2010-07-11 22:38:36Z

1

You definitely have to use GD2.

CI's image manipulation class is a bit temperamental sometimes. If you can not get things to work, check out timthumb. It's a small 1 file php script that resizes images on the fly and uses a caching system. You just pass the required paramters through the src attribute of your image tag. Very easy, works very well and much less of a headache than CI's image manipulation class.

answered Jul 11, 2010 at 22:38

stef

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2 Comments

Ignacio Over a year ago

Yeah, I know it and I'm definitely considering it since this is not working.

Ignacio Over a year ago

Well, I'm marking this as correct, since I ended up with the allmighty timthumb :)

Kieran Allen · Accepted Answer · 2010-07-11 19:34:19Z

0

remove $config_image['new_image'] = 'uploads/thumbs/'; and change $config['image_library'] = 'gd'; to $config['image_library'] = 'gd2';

Also make sure the $data array contains the full_path.

answered Jul 11, 2010 at 19:34

Kieran Allen

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Comments

user290102 · Accepted Answer · 2010-07-12 09:12:03Z

0

Simple question, are the file permissions correct? Another tip would be to set CIs error logging to the highest leven and see if it outputs anything.

answered Jul 12, 2010 at 9:12

user290102

1 Comment

Ignacio Over a year ago

Well, I think so, but I'm not 100% sure. I'll check on that thoroughly.

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