the converted image appears in black and white instead of color, so I added the ‘-colorspace sRGB’ option to solve this problem, but it does not work.

public function publish_remake_image()
    {

        $temp_name = time();
        $this->IMG = $this->input->get('dfimg');
        // 800     ȵǴ      ū  ̹        
        list($width, $height, $type, $attr) = getimagesize($this->IMG);

        if($width < 800 && $height < 1180 || $width < 950 && $height < 610 ) {
            //         ̹     ٿ ε 
            //if(!file_exists($img)) {
            $this->load->library('srbftp'); // ftp    ۰   
            $img = $this->srbftp->design_tmp_save($this->IMG, $temp_name );
            //}

            $this->REIMG = 'http://'.$_SERVER['HTTP_HOST'].'/tmp/design_tmp/'.$temp_name.'_re.jpg';
            //if(!file_exists($this->REIMG)) {
            // ū  ̹        
            shell_exec('/usr/local/imagemagick/bin/composite -size 800x1180 -gravity center '.$img.' '.$_SERVER['DOCUMENT_ROOT'].'/images/bg_convert.png  -colorspace sRGB '.$_SERVER['DOCUMENT_ROOT'].'/tmp/design_tmp/'.$temp_name.'_re.jpg');
            //}
        }  elseif($width < 950 && $height < 610) {
             //         ̹     ٿ ε 
            //if(!file_exists($img)) {
            $this->load->library('srbftp'); // ftp    ۰   
            $img = $this->srbftp->design_tmp_save($this->IMG, $temp_name );
            //}

            $this->REIMG = 'http://'.$_SERVER['HTTP_HOST'].'/tmp/design_tmp/'.$temp_name.'_re.jpg';
            //if(!file_exists($this->REIMG)) {
            // ū  ̹        
            shell_exec('/usr/local/imagemagick/bin/composite -size 1180x800 -gravity center '.$img.' '.$_SERVER['DOCUMENT_ROOT'].'/images/bg_convert_1.png -colorspace sRGB '.$_SERVER['DOCUMENT_ROOT'].'/tmp/design_tmp/'.$temp_name.'_re.jpg');
            //}

        } else {
            $this->REIMG = $this->IMG;
        }

        //$this->load->view('head_no');
        $this->output->set_header("Content-Type:text/html; charset=euc-kr");
        $this->load->view('contract/contract_image_remake');
    }

the converted image appears in black and white instead of color, so I added the ‘-colorspace sRGB’ option to solve this problem, but it does not work.