ColorThief\ColorThief::quantize PHP Method

    private static function quantize($pixels, $maxColors)
    {
        // short-circuit
        if (!count($pixels) || $maxColors < 2 || $maxColors > 256) {
            // echo 'wrong number of maxcolors'."\n";
            return false;
        }
        $histo = static::getHisto($pixels);
        // check that we aren't below maxcolors already
        //if (count($histo) <= $maxcolors) {
        // XXX: generate the new colors from the histo and return
        //}
        $vBox = static::vboxFromHistogram($histo);
        $priorityQueue = new PQueue(function ($a, $b) {
            return ColorThief::naturalOrder($a->count(), $b->count());
        });
        $priorityQueue->push($vBox);
        // first set of colors, sorted by population
        static::quantizeIter($priorityQueue, static::FRACT_BY_POPULATIONS * $maxColors, $histo);
        // Re-sort by the product of pixel occupancy times the size in color space.
        $priorityQueue->setComparator(function ($a, $b) {
            return ColorThief::naturalOrder($a->count() * $a->volume(), $b->count() * $b->volume());
        });
        // next set - generate the median cuts using the (npix * vol) sorting.
        static::quantizeIter($priorityQueue, $maxColors - $priorityQueue->size(), $histo);
        // calculate the actual colors
        $cmap = new CMap();
        for ($i = $priorityQueue->size(); $i > 0; $i--) {
            $cmap->push($priorityQueue->pop());
        }
        return $cmap;
    }