我使用html2canvas从此代码生成屏幕抓图jpg。不过,我不能针对一个particaular div,所以我抓住整个屏幕。来自base64_decode的PHP裁剪图像
$canvasImg = $_POST['img'];
$data = base64_decode($canvasImg);
$File = "z.jpg";
$Handle = fopen($File, 'w');
fwrite($Handle, $data);
fclose($Handle);
问题:我怎么能裁剪图像?
这是我attampt
$canvasImg = $_POST['img'];
$image = base64_decode($canvasImg);
$dest_image = 'z.jpg';
$img = imagecreatetruecolor('200','150');
$org_img = imagecreatefromstring($image);
$ims = getimagesize($image);
imagecopy($img,$org_img, 0, 0, 20, 20, 200, 150);
imagejpeg($img,$dest_image,90);
imagedestroy($img);
但即时得到一个错误
Warning: getimagesize(�PNG ) [<a href='function.getimagesize'>function.getimagesize</a>]: failed to open stream: Invalid argument
您正在寻找imagecreatefromstring()http://php.net/manual/en/function.imagecreatefromstring.php –
你是不是传递一个图像到imagecreatefrompng(),有一定的误差与图像变量 –
重编辑我的问题,实现'imagecreatefromstring()' –