PHP: Black strip on image while using GD library

Question

I have a little problem with GD library in PHP - I resize image and then I want crop it to 320px (width) / 240px (height). Let me say that resized image is 320px/300px. When I crop it, a 1-px black strip appears on the bottom of the image - I don't know why. I'm using imagecrop, imagecreatefromjpeg and imagecopyresampled

Here's the example:

Thanks for your time.

The code

$filename = '../store/projects/project-123.jpg';
$mime = mime_content_type($filename);
list($w, $h) = getimagesize($filename);

$prop = $w / $h;
$new_w = 0;
$new_h = 0;

if ($prop <= 4/3) {
    $new_w = 320;
    $new_h = (int)floor($h*($new_w/$w));
} else {
    $new_h = 240;
    $new_w = (int)floor($w*($new_h/$h));
}

$thumb = imagecreatetruecolor($new_w, $new_h);

if (strcmp($mime,'image/png') == 0) {
    header('Content-Type: image/png');
    $source = imagecreatefrompng($filename);
} else {
    header('Content-Type: image/jpeg');
    $source = imagecreatefromjpeg($filename);
}

imagecopyresampled($thumb, $source, 0, 0, 0, 0, $new_w, $new_h, $w, $h);

$filename = '../store/projects-thumbs/project-123.jpg';

$crop_data = array('x' => 0 , 'y' => 0, 'width' => 320, 'height'=> 240);
$thumb = imagecrop($thumb, $crop_data);

imagejpeg($thumb, $filename, 100);  


imagedestroy($thumb);
imagedestroy($source);

Answer 1

imagecrop() has a known bug that causes the black bottom border to be added.

You can work around the problem using imagecopyresized(). See my answer to another SO question asking for an imagecrop() alternative.