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//获取源图gd图像标识符 $srcImg = imagecreatefrompng('./src.png'); $srcWidth = imagesx($srcImg); $srcHeight = imagesy($srcImg); //创建新图 $newWidth = round($srcWidth / 2); $newHeight = round($srcHeight / 2); $newImg = imagecreatetruecolor($newWidth, $newHeight); //分配颜色 + alpha,将颜色填充到新图上 $alpha = imagecolorallocatealpha($newImg, 0, 0, 0, 127); imagefill($newImg, 0, 0, $alpha); //将源图拷贝到新图上,并设置在保存 PNG 图像时保存完整的 alpha 通道信息 imagecopyresampled($newImg, $srcImg, 0, 0, 0, 0, $newWidth, $newHeight, $srcWidth, $srcHeight); imagesavealpha($newImg, true); imagepng($newImg, './dst.png');