Fatal error: Uncaught exception 'ImagickException' with message 'Compositing ima

$image_name4=$Process.'4.gif';

$inimg3=$Process.'1.jpg';

$animation3 = new Imagick();

		$animation3->setFormat("gif");

		$i=0;

		$image4 = new Imagick(realpath($image_name4));

		$image4 = $image4->coalesceImages();

foreach($image4 as $frame){ 

			if(!is_file($inimg3)){

				echo  '水印图像不存在';

			}

			$img = new Imagick();

			$img->readImageBlob($frame);

			$draw = new ImagickDraw();

			$draw->color(0,0,imagick::PAINT_FLOODFILL);

			$water = new Imagick(realpath($inimg3));

			$draw->composite($water->getImageCompose(),0,0,320, 256,$water);

			$img->drawImage($draw);

                        $animation3->addImage( $img );

			$animation3->setImageDelay( $img->getImageDelay() );//

			$draw->destroy();

                        $water->destroy();

			$img->destroy();

}

$animation3->writeImages($Process.''.$id.'X.gif', true);//生成3X

		$animation3->destroy();

在Linux 下报错，本地win7是好的：Uncaught exception 'ImagickException' with message 'Compositing image failed' 。
ImagickDraw->composite(40, 0, 0, 320, 256, Object(Imagick)) #1 {main} thrown in