Description:
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I've create a script based on imagecrop() function to crop an image.
After testing I saw that a black line were added on the bottom of the cropped image.

The expected result sould be a white image (based on the example below) with 250px width and height.

Test script:
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$image = imagecreatetruecolor(500, 500); 
imagefill($image, 0, 0, imagecolorallocate($images, 255, 255, 255));

$ressource = imagecrop($image, ['x' => 0, 'y' => 0, 'width' => 250, 'height' => 250]);
imagejpeg($ressource, 'test.jpg');