resize() 无法使用图像操作类

发布于 2024-09-09 08:13:17 字数 667 浏览 3 评论 0原文

我一直在阅读文档并尝试一切方法来从上传的图像中取出拇指，但我似乎找不到问题。

图像已正确上传并保存，但拇指则不然，失败且没有错误输出。这是我正在使用的代码：

$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());
}

另外，我想调整图像大小以适合 max-width=750，但保持比例。我为实现这一目标所做的事情正确吗？谢谢！

原文

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!

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眼藏柔 2024-09-16 08:13:17

我知道这有点太晚了，但我最近遇到了同样的问题，并通过初始化类来解决它。

CodeIgniter 示例不起作用，您必须先加载该类：

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

然后在设置所需的配置后，然后像这样初始化该类：

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

这立即对我有用。

我发布此内容是为了防止其他人遇到同样的问题，因此他们使用 CodeIgniter 而不是其他库来解决它。

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.

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时间海 2024-09-16 08:13:17

也许宽度和高度都必须指定？只需尝试使用固定高度（并在第二步中进行纵横比感知缩放）。

为了保持比例，很简单，首先计算图像的纵横比，然后计算目标高度：

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

您可以从简单的数学中推导出来：r = w/h。因此，w=r*h（=目标宽度，如果您有固定高度）和 h = w/r（=目标高度，如果您有固定宽度）。

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).

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