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php gd GRAYSCALE

i have a code in php with the GD library and it gives error

here is the code :

<?php
    header('content-type: image/png');
    $image = imagecreatefrompng('a.png');
    imagefilter($image, IMG_FILTER_GRAYSCALE);
    imagepng($image);
    imagedestroy($image);
?>

and here is the error :

the image localhost/image/gdimg.php cannot displayed because it contains errors

what is wrong here?

Solution

  • remove line

    header('content-type: image/png');

    and you will see php error.