php的PNG图像Alpha颜色问题

Question

我有这个公共功能：

 public function resize($width, $height)
{
    $newImage = imagecreatetruecolor($width, $height);
    if($this->_imageType == IMAGETYPE_PNG && $this->_transparent === true){
        imagealphablending($newImage, false);
        imagesavealpha($newImage, true);
        imagefilledrectangle($newImage, 0, 0, $width, $height, imagecolorallocatealpha($newImage, 255, 255, 255, 127));
    }
    imagecopyresampled($newImage, $this->_image, 0, 0, 0, 0, $width, $height, $this->getWidth(), $this->getHeight());
    $this->_image = $newImage;
}

预览图像时出现我的问题。它不显示 alpha 颜色。我能得到一些帮助吗？

Answer 1

尝试将 imagealphablending 设置为 true，而不是 false。