nwtn\Respimg::thumbnailImage PHP Method

    public function thumbnailImage($columns, $rows, $bestfit = false, $fill = false, $filter = \Imagick::FILTER_TRIANGLE)
    {
        // sample factor; defined in original ImageMagick thumbnailImage function
        // the scale to which the image should be resized using the `sample` function
        $SampleFactor = 5;
        // filter whitelist
        $filters = array(\Imagick::FILTER_POINT, \Imagick::FILTER_BOX, \Imagick::FILTER_TRIANGLE, \Imagick::FILTER_HERMITE, \Imagick::FILTER_HANNING, \Imagick::FILTER_HAMMING, \Imagick::FILTER_BLACKMAN, \Imagick::FILTER_GAUSSIAN, \Imagick::FILTER_QUADRATIC, \Imagick::FILTER_CUBIC, \Imagick::FILTER_CATROM, \Imagick::FILTER_MITCHELL, \Imagick::FILTER_LANCZOS, \Imagick::FILTER_BESSEL, \Imagick::FILTER_SINC);
        // Parse parameters given to function
        $columns = (double) $columns;
        $rows = (double) $rows;
        $bestfit = (bool) $bestfit;
        $fill = (bool) $fill;
        // We can’t resize to (0,0)
        if ($rows < 1 && $columns < 1) {
            return false;
        }
        // Set a default filter if an acceptable one wasn’t passed
        if (!in_array($filter, $filters)) {
            $filter = \Imagick::FILTER_TRIANGLE;
        }
        // figure out the output width and height
        $width = (double) $this->getImageWidth();
        $height = (double) $this->getImageHeight();
        $new_width = $columns;
        $new_height = $rows;
        $x_factor = $columns / $width;
        $y_factor = $rows / $height;
        if ($rows < 1) {
            $new_height = round($x_factor * $height);
        } elseif ($columns < 1) {
            $new_width = round($y_factor * $width);
        }
        // if bestfit is true, the new_width/new_height of the image will be different than
        // the columns/rows parameters; those will define a bounding box in which the image will be fit
        if ($bestfit && $x_factor > $y_factor) {
            $x_factor = $y_factor;
            $new_width = round($y_factor * $width);
        } elseif ($bestfit && $y_factor > $x_factor) {
            $y_factor = $x_factor;
            $new_height = round($x_factor * $height);
        }
        if ($new_width < 1) {
            $new_width = 1;
        }
        if ($new_height < 1) {
            $new_height = 1;
        }
        // if we’re resizing the image to more than about 1/3 it’s original size
        // then just use the resize function
        if ($x_factor * $y_factor > 0.1) {
            $this->resizeImage($new_width, $new_height, $filter, 1);
            // if we’d be using sample to scale to smaller than 128x128, just use resize
        } elseif ($SampleFactor * $new_width < 128 || $SampleFactor * $new_height < 128) {
            $this->resizeImage($new_width, $new_height, $filter, 1);
            // otherwise, use sample first, then resize
        } else {
            $this->sampleImage($SampleFactor * $new_width, $SampleFactor * $new_height);
            $this->resizeImage($new_width, $new_height, $filter, 1);
        }
        // if the alpha channel is not defined, make it opaque
        if ($this->getImageAlphaChannel() == \Imagick::ALPHACHANNEL_UNDEFINED) {
            $this->setImageAlphaChannel(\Imagick::ALPHACHANNEL_OPAQUE);
        }
        // set the image’s bit depth to 8 bits
        $this->setImageDepth(8);
        // turn off interlacing
        $this->setInterlaceScheme(\Imagick::INTERLACE_NO);
        // Strip all profiles except color profiles.
        foreach ($this->getImageProfiles('*', true) as $key => $value) {
            if ($key != 'icc' && $key != 'icm') {
                $this->removeImageProfile($key);
            }
        }
        if (method_exists($this, 'deleteImageProperty')) {
            $this->deleteImageProperty('comment');
            $this->deleteImageProperty('Thumb::URI');
            $this->deleteImageProperty('Thumb::MTime');
            $this->deleteImageProperty('Thumb::Size');
            $this->deleteImageProperty('Thumb::Mimetype');
            $this->deleteImageProperty('software');
            $this->deleteImageProperty('Thumb::Image::Width');
            $this->deleteImageProperty('Thumb::Image::Height');
            $this->deleteImageProperty('Thumb::Document::Pages');
        } else {
            $this->setImageProperty('comment', '');
            $this->setImageProperty('Thumb::URI', '');
            $this->setImageProperty('Thumb::MTime', '');
            $this->setImageProperty('Thumb::Size', '');
            $this->setImageProperty('Thumb::Mimetype', '');
            $this->setImageProperty('software', '');
            $this->setImageProperty('Thumb::Image::Width', '');
            $this->setImageProperty('Thumb::Image::Height', '');
            $this->setImageProperty('Thumb::Document::Pages', '');
        }
        // In case user wants to fill use extent for it rather than creating a new canvas
        // …fill out the bounding box
        if ($bestfit && $fill && ($new_width != $columns || $new_height != $rows)) {
            $extent_x = 0;
            $extent_y = 0;
            if ($columns > $new_width) {
                $extent_x = ($columns - $new_width) / 2;
            }
            if ($rows > $new_height) {
                $extent_y = ($rows - $new_height) / 2;
            }
            $this->extentImage($columns, $rows, 0 - $extent_x, $extent_y);
        }
        return true;
    }