Codeigniter实现智能裁剪图片的方法_PHP教程
程序员文章站
2022-05-21 19:41:00
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一副1024*768大小的图片,裁剪到240*240大小,裁剪后不失真,尽可能保留图片主题含义。
$this->load->library('image_lib');
list($width, $height) = getimagesize("upload/123.jpg");
$config['image_library'] = 'gd2';
$config['source_image'] = 'upload/123.jpg';
$config['maintain_ratio'] = TRUE;
if($width >= $height)
{
$config['master_dim'] = 'height';
}else{
$config['master_dim'] = 'width';
}
$config['width'] = 240;
$config['height'] = 240;
$this->image_lib->initialize($config);
$this->image_lib->resize();
$config['maintain_ratio'] = FALSE;
if($width >= $height)
{
$config['x_axis'] = floor(($width * 240 / $height - 240)/2);
}else{
$config['y_axis'] = floor(($height * 240 / $width - 240)/2);
}
$this->image_lib->initialize($config);
$this->image_lib->crop();
我使用到的方法:
1. 先将图片等比例缩略到可以裁剪的大小;
如果是宽幅图片,则按高度等比例缩放到高度 = 240px,窄幅图片(高度大于宽度)则按宽度等比例缩放;
2. 按长宽格式居中裁剪;
保留缩略后的图片中间部分;
复制代码 代码如下:
$this->load->library('image_lib');
list($width, $height) = getimagesize("upload/123.jpg");
$config['image_library'] = 'gd2';
$config['source_image'] = 'upload/123.jpg';
$config['maintain_ratio'] = TRUE;
if($width >= $height)
{
$config['master_dim'] = 'height';
}else{
$config['master_dim'] = 'width';
}
$config['width'] = 240;
$config['height'] = 240;
$this->image_lib->initialize($config);
$this->image_lib->resize();
$config['maintain_ratio'] = FALSE;
if($width >= $height)
{
$config['x_axis'] = floor(($width * 240 / $height - 240)/2);
}else{
$config['y_axis'] = floor(($height * 240 / $width - 240)/2);
}
$this->image_lib->initialize($config);
$this->image_lib->crop();