How to create Thumbnail Image in PHP without loosing its Original Quality using GD Library -

if(isset($_post["insert"]))    {       foreach($_files $imgfile)       {         $tmp_name = $imgfile['tmp_name'];         $type = $imgfile['type'];         $name = $imgfile['name']; //name of original image         $size = $imgfile['size'];          if (file_exists($tmp_name))         {          if(is_uploaded_file($tmp_name))             {                 $target="realimage/";                 $target .= basename($_files['image']['name']); //path of original image                 $file = fopen($tmp_name,'r');                 $data = fread($file,filesize($tmp_name));                 fclose($file);                 $data = chunk_split(base64_encode($data));                 move_uploaded_file($tmp_name,$target);             }                 $extension=  explode(".", $target);                 $extension=$extension[count($extension)-1]; //gives image extension                 $maxwidth=400;                 $maxheight=200;                 switch($extension) {                     case 'gif':                         $tmpimg = imagecreatefromgif($target);                         break;                     case 'jpg':                         $tmpimg = imagecreatefromjpeg($target);                         break;                     case 'png':                         $tmpimg = imagecreatefrompng($target);                         break;                 }                                list($width,$height)=getimagesize($target);                 if($width > $height)                 {                     $thumb_width=$maxwidth;                     $thumb_height=  intval($height*$thumb_width/$width);                 }                 else                 {                     $thumb_height= $maxheight;                     $thumb_width=intval($width*$thumb_height/$height);                 }                 $dest_x = intval(($maxwidth - $thumb_width) / 2);                 $dest_y = intval(($maxheight - $thumb_height) / 2);                  $newimg=  imagecreatetruecolor($maxwidth,$maxheight);   imagecopyresampled($newimg,$tmpimg,$dest_x,$dest_y,0,0,$thumb_width,$thumb_height,$width,$height);                  imagejpeg($newimg,"thumbimage/$name",100);         }          }         } 

the code 1) uploading image in folder "realimage" . 2) want display resized image of realimage on website . hav created folder "thumbimage" stores thumbnail image of original.

the code create thumbnails images larger specified thumbnail width , height, quality looses , blur images. want image quality same original image , size should small original.

i have got problem well, when upload image smaller specified thumbnail width & height , image not fit area , fills part of area leaving other area black.

help me in creating ideal thumbnail meeting scenarios.

try this:

$type = exif_imagetype($pathtoimages);  $width = imagesx($img);  $height = imagesy($img);  // calculate thumbnail size  if ($width >= $height) {      //if width greater height      $new_width = $thumbwidth;      $new_height = floor($height * ($thumbwidth / $width));  } else {      //if height greater width      $new_height = $thumbwidth;      $new_width = floor($width * ($thumbwidth / $height));  }  // create new temporary image  // echo $new_height;  $tmp_img = imagecreatetruecolor($new_width, $new_height);    imagecopyresampled($tmp_img, $img, 0, 0, 0, 0, $new_width, $new_height, $width, $height);      // save thumbnail file switch($type) {      case 1 :          imagegif($tmp_img, $pathtothumbs . $file_name,90);         break;     case 2 :                     imagejpeg($tmp_img, $pathtothumbs . $file_name,90);         break;     case 3 :                                    imagepng($tmp_img, $pathtothumbs . $file_name,90);         break;     case 6 :                     imagewbmp($tmp_img, $pathtothumbs . $file_name,90);         break; }