NFePHP\Extras\PdfNFePHP::_putimages PHP Method

    function _putimages()
    {
        $filter = $this->compress ? '/Filter /FlateDecode ' : '';
        reset($this->images);
        while (list($file, $info) = each($this->images)) {
            $this->_newobj();
            $this->images[$file]['n'] = $this->n;
            $this->_out('<</Type /XObject');
            $this->_out('/Subtype /Image');
            $this->_out('/Width ' . $info['w']);
            $this->_out('/Height ' . $info['h']);
            if (isset($info['masked'])) {
                $this->_out('/SMask ' . ($this->n - 1) . ' 0 R');
            }
            if ($info['cs'] == 'Indexed') {
                $this->_out('/ColorSpace [/Indexed /DeviceRGB ' . (strlen($info['pal']) / 3 - 1) . ' ' . ($this->n + 1) . ' 0 R]');
            } else {
                $this->_out('/ColorSpace /' . $info['cs']);
                if ($info['cs'] == 'DeviceCMYK') {
                    $this->_out('/Decode [1 0 1 0 1 0 1 0]');
                }
            }
            $this->_out('/BitsPerComponent ' . $info['bpc']);
            if (isset($info['f'])) {
                $this->_out('/Filter /' . $info['f']);
            }
            if (isset($info['parms'])) {
                $this->_out($info['parms']);
            }
            if (isset($info['trns']) && is_array($info['trns'])) {
                $trns = '';
                for ($i = 0; $i < count($info['trns']); $i++) {
                    $trns .= $info['trns'][$i] . ' ' . $info['trns'][$i] . ' ';
                }
                $this->_out('/Mask [' . $trns . ']');
            }
            $this->_out('/Length ' . strlen($info['data']) . '>>');
            $this->_putstream($info['data']);
            unset($this->images[$file]['data']);
            $this->_out('endobj');
            //Palette
            if ($info['cs'] == 'Indexed') {
                $this->_newobj();
                $pal = $this->compress ? gzcompress($info['pal']) : $info['pal'];
                $this->_out('<<' . $filter . '/Length ' . strlen($pal) . '>>');
                $this->_putstream($pal);
                $this->_out('endobj');
            }
        }
    }