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Edit File: MaskCommand.php

<?php

namespace Intervention\Image\Imagick\Commands;

use Intervention\Image\Commands\AbstractCommand;

class MaskCommand extends AbstractCommand
{
    /**
     * Applies an alpha mask to an image
     *
     * @param  \Intervention\Image\Image $image
     * @return boolean
     */
    public function execute($image)
    {
        $mask_source = $this->argument(0)->value();
        $mask_w_alpha = $this->argument(1)->type('bool')->value(false);

// get imagick
        $imagick = $image->getCore();

// build mask image from source
        $mask = $image->getDriver()->init($mask_source);

// resize mask to size of current image (if necessary)
        $image_size = $image->getSize();
        if ($mask->getSize() != $image_size) {
            $mask->resize($image_size->width, $image_size->height);
        }

$imagick->setImageMatte(true);

if ($mask_w_alpha) {

// just mask with alpha map
            $imagick->compositeImage($mask->getCore(), \Imagick::COMPOSITE_DSTIN, 0, 0);

} else {

// get alpha channel of original as greyscale image
            $original_alpha = clone $imagick;
            $original_alpha->separateImageChannel(\Imagick::CHANNEL_ALPHA);

// use red channel from mask ask alpha
            $mask_alpha = clone $mask->getCore();
            $mask_alpha->compositeImage($mask->getCore(), \Imagick::COMPOSITE_DEFAULT, 0, 0);
            // $mask_alpha->setImageAlphaChannel(\Imagick::ALPHACHANNEL_DEACTIVATE);
            $mask_alpha->separateImageChannel(\Imagick::CHANNEL_ALL);

// combine both alphas from original and mask
            $original_alpha->compositeImage($mask_alpha, \Imagick::COMPOSITE_COPYOPACITY, 0, 0);

// mask the image with the alpha combination
            $imagick->compositeImage($original_alpha, \Imagick::COMPOSITE_DSTIN, 0, 0);
        }

return true;
    }
}

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