업로드 된 이미지에서 검정색 배경을 표시하는 미리보기 이미지 만들기

Question

이미지 미리보기 이미지가 표시되지만 배경이 black.i 인 이유를 이해할 수 없습니다.이 스크립트는 stackoverflow에서 발견되었습니다./: 은 GD의 library.i'm에서 문제를 사용하여 XAMPP

makeThumbnails($upload_dir.$new_nm,227,182,$upload_dir_thumb.$new_nm); 
function makeThumbnails($src,$w,$h,$dir) 
{ 
    $arr_image_details = getimagesize($src); 
    $original_width = $arr_image_details[0]; 
    $original_height = $arr_image_details[1]; 

    if ($original_width > $original_height) { 
     $new_width = $w; 
     $new_height = intval($original_height * $new_width/$original_width); 
    } else { 
     $new_height = $h; 
     $new_width = intval($original_width * $new_height/$original_height); 
    } 
    $dest_x = intval(($w - $new_width)/2); 
    $dest_y = intval(($h - $new_height)/2); 

    if ($arr_image_details[2] == 1) { 
     $imgt = "ImageGIF"; 
     $imgcreatefrom = "ImageCreateFromGIF"; 
    } 
    if ($arr_image_details[2] == 2) { 
     $imgt = "ImageJPEG"; 
     $imgcreatefrom = "ImageCreateFromJPEG"; 
    } 
    if ($arr_image_details[2] == 3) { 
     $imgt = "ImagePNG"; 
     $imgcreatefrom = "ImageCreateFromPNG"; 
    } 
    if ($imgt) { 
     $old_image = $imgcreatefrom($src); 
     $new_image = imagecreatetruecolor($w, $h); 
     imagecopyresized($new_image, $old_image, $dest_x, $dest_y, 0, 0, $new_width, $new_height, $original_width, $original_height); 
     $imgt($new_image, $dir); 
    } 

Answer 1

내가 HTTP에서이 코드를 가지고 당신은 $old_image = $imgcreatefrom($src)

What will return `$imgcreatefrom($src)` check it. 

Answer 2

function makethumb($raw,$tw,$th,$DestFolder) 
{ 
    $arr_image_details = getimagesize($raw); 
    $CurWidth = $arr_image_details[0]; 
    $CurHeight = $arr_image_details[1]; 
    //print_r($arr_image_details);exit; 
    switch(strtolower($arr_image_details['mime'])) 
    { 

       case 'image/png': 
        $CreatedImage = imagecreatefrompng($raw); 
        break; 
       case 'image/gif': 
        $CreatedImage = imagecreatefromgif($raw); 
        break; 
       case 'image/jpeg': 
       case 'image/pjpeg': 
        $CreatedImage = imagecreatefromjpeg($raw); 
        break; 
       default: 
        $processImage = false; //image format is not supported! 
    } 
    if($tw >=$th) 
    { 
     $MaxSize=$tw; 
    }else{ 
     $MaxSize=$th; 
    } 
    $ImageScale   = min($MaxSize/$CurWidth, $MaxSize/$CurHeight); 
    $NewWidth   = ceil($ImageScale*$CurWidth); 
    $NewHeight   = ceil($ImageScale*$CurHeight); 
    if($CurWidth < $NewWidth || $CurHeight < $NewHeight) 
    { 
     $NewWidth = $CurWidth; 
     $NewHeight = $CurHeight; 
    } 
    $NewCanves = imagecreatetruecolor($NewWidth, $NewHeight); 

    if(imagecopyresampled($NewCanves, $CreatedImage,0, 0, 0, 0, $NewWidth, $NewHeight, $CurWidth, $CurHeight)) 
    { 
     switch(strtolower($arr_image_details['mime'])) 
     { 
      case 'image/png': 
       imagepng($NewCanves,$DestFolder); 
       break; 
      case 'image/gif': 
       imagegif($NewCanves,$DestFolder); 
       break;   
      case 'image/jpeg': 
      case 'image/pjpeg': 
       imagejpeg($NewCanves,$DestFolder,90); 
       break; 
      default: 
       return false; 
     } 
    if(is_resource($NewCanves)) { 
     imagedestroy($NewCanves); 
    } 
    return true; 
    } 




}