Codeigniter智能裁剪图片
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。
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;
<?php $this->load->library('image_lib'); list($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(); // by www.jb200.com $config['maintain_ratio'] = FALSE; if($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();