Get the most common color from an image using the PHP Intervention library

PrimaryColor.php

<?php

use Intervention\Image\Filters\FilterInterface;

/**
 * A simple filter to get the predominant color from an image using the
 * Intervention library (http://image.intervention.io).
 *
 * Usage with no options:
 * $image = Image::make($file);
 * $primaryColor = $image->filter(new PrimaryColor());
 *
 * Usage with options:
 * $image = Image::make($file);
 * $filter = new PrimaryColor();
 * $primaryColor = $image->filter($filter->format('hex')
 *                         ->ignores(['#ffffff']));
 */

class PrimaryColor implements FilterInterface
{
    /**
     * The color format to return
     *
     * @var string
     */
    protected $format = 'hex';

    /**
     * Colors to ignore
     * 
     * @var array
     */
    protected $ignores = [
        '#ffffff',
        '#000000'
    ];

    /**
     * Applies filter effects to given image
     *
     * @param  \Intervention\Image\Image $image
     * @return array
     */
    public function applyFilter(\Intervention\Image\Image $image)
    {
        foreach (range(0, $image->height() - 1) as $y) {
            foreach (range(0, $image->width() - 1) as $x) {
                $color = $image->pickColor($x, $y, $this->format);

                if (isset($occurrences[$color])) {
                    $occurrences[$color]++;
                } else {
                    $occurrences[$color] = 1;
                }
            }
        }

        arsort($occurrences);

        $this->removeIgnoredColors($occurrences);

        return key($occurrences);
    }

    /**
     * Remove all the ignored colors from the results
     * 
     * @param  array &$occurrences
     * @return void
     */
    protected function removeIgnoredColors(&$occurrences)
    {
        foreach ($this->ignores as $color) {
            unset($occurrences[$color]);
        }
    }

    /**
     * Set the colors to ignore
     * 
     * @param  array  $colors
     * @return $this
     */
    public function ignores(array $colors)
    {
        $this->ignores = $colors;

        return $this;
    }

    /**
     * Set the color format
     * 
     * @param  string $format
     * @return $this
     */
    public function format($format)
    {
        $this->format = $format;

        return $this;
    }
}