diff --git a/classes/file/FileHandler.class.php b/classes/file/FileHandler.class.php
index 6ffe9b8b67..e7ce6cd45a 100644
--- a/classes/file/FileHandler.class.php
+++ b/classes/file/FileHandler.class.php
@@ -751,9 +751,10 @@ function checkMemoryLoadImage(&$imageInfo)
 	 * @param int $resize_height Height to resize
 	 * @param string $target_type If $target_type is set (gif, jpg, png, bmp), result image will be saved as target type
 	 * @param string $thumbnail_type Thumbnail type(crop, ratio)
+	 * @param bool $thumbnail_transparent If $target_type is png, set background set transparent color
 	 * @return bool TRUE: success, FALSE: failed
 	 */
-	function createImageFile($source_file, $target_file, $resize_width = 0, $resize_height = 0, $target_type = '', $thumbnail_type = 'crop')
+	function createImageFile($source_file, $target_file, $resize_width = 0, $resize_height = 0, $target_type = '', $thumbnail_type = 'crop', $thumbnail_transparent = FALSE)
 	{
 		// check params
 		if (($source_file = self::exists($source_file)) === FALSE)
@@ -841,7 +842,24 @@ function createImageFile($source_file, $target_file, $resize_width = 0, $resize_
 			return FALSE;
 		}
 
-		imagefilledrectangle($thumb, 0, 0, $resize_width - 1, $resize_height - 1, imagecolorallocate($thumb, 255, 255, 255));
+		if(function_exists('imagecolorallocatealpha') && $target_type == 'png' && $thumbnail_transparent)
+		{
+			imagefill($thumb, 0, 0, imagecolorallocatealpha($thumb, 0, 0, 0, 127));
+			
+			if(function_exists('imagesavealpha'))
+			{
+				imagesavealpha($thumb, TRUE);
+			}
+
+			if(function_exists('imagealphablending'))
+			{
+				imagealphablending($thumb, TRUE);
+			}
+		}
+		else
+		{
+			imagefilledrectangle($thumb, 0, 0, $resize_width - 1, $resize_height - 1, imagecolorallocate($thumb, 255, 255, 255));
+		}
 
 		// create temporary image having original type
 		$source = NULL;
diff --git a/modules/member/lang/lang.xml b/modules/member/lang/lang.xml
index f1572a0c77..f28617b135 100644
--- a/modules/member/lang/lang.xml
+++ b/modules/member/lang/lang.xml
@@ -2806,4 +2806,9 @@
 		<value xml:lang="en"><![CDATA[Warning! Please remember current site setting doesn't accept new member.]]></value>
 		<value xml:lang="jp"><![CDATA[注意！現在のサイト設定は、会員登録を許可していないということを覚えなさい。]]></value>
 	</item>
+	<item name="allow_transparent_thumbnail">
+		<value xml:lang="ko"><![CDATA[리사이즈 이미지에 투명 배경을 허용합니다. (PNG only)]]></value>
+		<value xml:lang="en"><![CDATA[Allow transparent background on resized image (PNG only)]]></value>
+		<value xml:lang="jp"><![CDATA[サイズ変更した画像に透明な背景を許可します。(PNG only)]]></value>
+	</item>
 </lang>
diff --git a/modules/member/member.admin.controller.php b/modules/member/member.admin.controller.php
index 45b9b5099b..2254d2b393 100644
--- a/modules/member/member.admin.controller.php
+++ b/modules/member/member.admin.controller.php
@@ -292,6 +292,7 @@ public function procMemberAdminInsertSignupConfig()
 				$signupItem->max_width = $all_args->{$key.'_max_width'};
 				$signupItem->max_height = $all_args->{$key.'_max_height'};
 				$signupItem->max_filesize = $all_args->{$key.'_max_filesize'};
+				$signupItem->allow_transparent_thumbnail = $all_args->{$key.'_transparent_thumbnail'};
 			}
 
 			// set extends form
diff --git a/modules/member/member.controller.php b/modules/member/member.controller.php
index 4bf10efc00..b8a3a30914 100644
--- a/modules/member/member.controller.php
+++ b/modules/member/member.controller.php
@@ -766,6 +766,11 @@ function insertProfileImage($member_srl, $target_file)
 		$max_width = $config->profile_image_max_width;
 		$max_height = $config->profile_image_max_height;
 		$max_filesize = $config->profile_image_max_filesize;
+		foreach($config->signupForm as $val)
+		{
+			if($val->name == "profile_image")
+				$allow_transparent = $val->allow_transparent_thumbnail == 'Y';
+		}
 
 		Context::loadLang(_XE_PATH_ . 'modules/file/lang');
 
@@ -789,7 +794,7 @@ function insertProfileImage($member_srl, $target_file)
 		if(($width > $max_width || $height > $max_height ) && $type != 1)
 		{
 			$temp_filename = sprintf('files/cache/tmp/profile_image_%d.%s', $member_srl, $ext);
-			FileHandler::createImageFile($target_file, $temp_filename, $max_width, $max_height, $ext);
+			FileHandler::createImageFile($target_file, $temp_filename, $max_width, $max_height, $ext, 'crop', $allow_transparent);
 
 			// 파일 용량 제한
 			FileHandler::clearStatCache($temp_filename);
diff --git a/modules/member/tpl/signup_config.html b/modules/member/tpl/signup_config.html
index 453b38add5..9d85368e3c 100644
--- a/modules/member/tpl/signup_config.html
+++ b/modules/member/tpl/signup_config.html
@@ -132,6 +132,7 @@
 								<label for="{$item->name}_max_width" class="x_inline">{$lang->cmd_image_max_width} <input type="number" min="1" name="{$item->name}_max_width" id="{$item->name}_max_width" value="{$item->max_width}" /> px</label>
 								<label for="{$item->name}_max_height" class="x_inline">{$lang->cmd_image_max_height} <input type="number" min="1" name="{$item->name}_max_height" id="{$item->name}_max_height" value="{$item->max_height}" /> px</label>
 								<label for="{$item->name}_max_filesize">{$lang->allowed_filesize} : <input type="number" min="1" name="{$item->name}_max_filesize" id="{$item->name}_max_filesize" value="{$item->max_filesize}" /> KB</label>
+								<label for="{$item->name}_transparent_thumbnail" cond="$item->name == 'profile_image'"><input type="checkbox" value="Y" name="{$item->name}_transparent_thumbnail" id="{$item->name}_transparent_thumbnail" checked="checked"|cond="$item->allow_transparent_thumbnail" /> {$lang->allow_transparent_thumbnail}</label>
 							</div>
 
 							<div cond="$item->name == 'signature'" class="_subItem" style="display:none;padding-top:5px"|cond="!$item->isUse">