download blob image from database can not be open in php mysql

Question

when download image image is can't open .it just 4kb file.please help. image type is in blob.its downloading file.but can't visible.

 <?php
                    if(isset($_GET['task_id'])){
                    $id = $_GET['task_id'];

                        $sql =  "SELECT * FROM workload WHERE TID = $id ";
                        $info =  $obj_admin->manage_all_info($sql);
                   
                        $num_row = $info->rowCount();
                        if($num_row>0){
                            $i=0;
                          }
                          while( $row = $info->fetch(PDO::FETCH_ASSOC) ){

$image = 'images_uploaded/'. $row['imageA'];

                          header("Content-type: image/jpeg");
                          header('Content-Disposition: attachment; filename="table_with_image_image'.$id.'.jpg"');
                          header("Content-Transfer-Encoding: binary"); 
                          header('Expires: 0');
                          header('Pragma: no-cache');
                          header("Content-Length: ".strlen($image));
                          
                          echo $image;
                          exit();
                          
                        }

                      }
                         

?>