php - 无法在 Codeigniter 中调整水印图像的不透明度和大小

Question

我想调整水印图像的大小并添加不透明度，但我不能。我不知道我的代码有什么问题，请帮助我。TT

这是我的代码。

$this->load->library('image_lib');
$config['source_image'] = $image_url;
$config['new_image'] = $image_url;
$config['wm_overlay_path'] = $watermark_url;

$config['wm_type'] = 'overlay';
//the overlay image
$config['wm_opacity'] = 30;
$config['wm_vrt_alignment'] = 'middle';
$config['wm_hor_alignment'] = 'center';

$config['image_library'] = 'gd2';
$config['width'] = 50;
$config['height'] = 50;
$config['padding'] = 50;
$config['wm_vrt_offset'] = 100;

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

标签： phpcodeigniteruploadgdwatermark