Question

我想仅使用动态宽度创建一张新照片，以便高度随后根据宽度自动更改。

以下代码与我无关。

$w = $width;
$w = $w / 4 ;
$mconfig['width'] = $w;
$mconfig['maintain_ratio'] = TRUE;
$mconfig['source_image'] = 'uploads/watermark.png';
$mconfig['new_image'] = 'uploads/images/watermark/watermark.png';
$this->image_lib->initialize($mconfig);
$this->image_lib->resize();
$this->image_lib->clear();

Answer 1

尝试设置高度

例如

$config['height']       = 50;

Answer 2

试试这个：

//Imagine you need Width 1000px

$height = ($fdata["image_height"] * 1000) / $fdata['image_width'];
$resize_height = (int)$height;

$mconfig['width'] = 1000;
$mconfig['height'] = $resize_height; 
$mconfig['maintain_ratio'] = TRUE;
$mconfig['source_image'] = 'uploads/watermark.png';
$mconfig['new_image'] = 'uploads/images/watermark/watermark.png';
$this->image_lib->initialize($mconfig);
$this->image_lib->resize();
$this->image_lib->clear();

此处$fdata["image_height"]已上传图片高度，$fdata['image_width']已上传图片宽度。

Answer 3

试试这个，

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

$w = $width / 4;
$config['width'] = $w;
$config['height'] = round($uploaded_data['image_height']/($uploaded_data['image_width']/$w), 2);

$config['image_library'] = 'gd2';
$config['source_image'] = 'uploads/watermark.png';
$config['new_image'] = 'uploads/images/watermark/watermark.png';
$config['quality'] = "100%";
$config['maintain_ratio'] = true;

$this->load->library('image_lib', $config);
$this->image_lib->initialize($config);
if ($this->image_lib->resize()){
    $this->image_lib->clear(); 
    return true;
}else{
    return $this->image_lib->display_errors();
}

codeigniter按宽度调整图像大小

3 个答案: