如何使用代码点火器image_lib调整图像大小(质量） - how to resize image size(quality) with codeigniter image_lib

how to resize image size(quality) with codeigniter image_lib

我们正在创建一个允许图像上传的应用程序，现在我们想减小图像大小以减少页面加载时间，现在这是我正在使用的代码，它不起作用，图像大小保持 100% 它不会减少，请帮忙也许我错过了什么，或者我做错了什么

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    
    }
}

我正在使用代码点火器 3.0

你应该像这样使用没有%作为整数：

$config['quality'] = 50;

 $config['image_library']    = 'gd2';
 $config['quality']      = 60;

效果很好，调整质量并检查它保存的图像文件大小。会有所不同。

在质量更改开始工作之前，我还必须将image_library参数设置为"gd"。我想知道为什么它不适用于"gd2"

$config['image_library']    = 'gd';
$config['quality']      = 40;

我发现这不适合我使用 GD 或 GD2 库。为了影响"质量" - 我需要使用"ImageMagick"库。

如文档中所述 - 如果您使用"ImageMagick"或"NetPBM"库 - "您必须提供路径"：https://codeigniter.com/userguide3/libraries/image_lib.html

在我的 GoDaddy 服务器上，路径是"/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();
                }