Weird borders using mask() with Imagick

[billmn]

I notice some weird dark borders applying mask using Imagick.
Using GD, mask is very slow but borders seems ok.

Thought?

This is the code:

$image = Image::make('image.png');
$cutContour = Image::make('cut_contour.png');

$image->mask($cutContour, true);

return $image->response();

These are the original images:

image.png: https://pasteboard.co/GOrgBx4.png
cut_contour.png: https://pasteboard.co/GOrgUf2.png

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Result with Imagick

Result with GD