如何保存Imagick对象(php)

Question

我想这是一个愚蠢的问题,但这是我第一次处理php和图像处理.总之,我想知道如何保存图像而不是在网页上回显它.代码用于扭曲图像,这可能在这个问题中不重要,你可以在保存图像时看到最后几行.

代码:

/* Create new object */
$im = new Imagick('my_img.png');


$width = $im->getImageWidth();
$height = $im->getImageHeight();

/* Set the image format to png */
$im->setImageFormat('png');

/* Fill new visible areas with transparent */
$im->setImageVirtualPixelMethod(Imagick::VIRTUALPIXELMETHOD_TRANSPARENT);

/* Activate matte */
$im->setImageMatte(true);

/* Control points for the distortion */
$controlPoints = array( 0, 0, 
                    $height*0.7, $height*0.3,

                    0, $height,
                    0, $height,

                    $width, 0,
                    $height*0.7+$width, $height*0.3,

                    $width, $height,
                    $width, $height);

/* Perform the distortion */                       
$im->distortImage(Imagick::DISTORTION_PERSPECTIVE, $controlPoints, true);

/* Ouput the image */ 
//commented out because I want to save the image instead
//header("Content-Type: image/png");
//echo $im;

// right way to save image?
imagepng($im, 'new_image.png');

// Free up memory
imagedestroy($im);

我得到的错误:imagepng():提供的参数不是有效的图像资源...

Answer 1

更换

imagepng($im, 'new_image.png');

同

$im->writeImage('new_image.png');