diff --git a/cocos/2d/CCRenderTexture.cpp b/cocos/2d/CCRenderTexture.cpp
index f8d08d3185..7738341537 100644
--- a/cocos/2d/CCRenderTexture.cpp
+++ b/cocos/2d/CCRenderTexture.cpp
@@ -409,29 +409,47 @@ void RenderTexture::visit(Renderer *renderer, const Mat4 &parentTransform, uint3
     _orderOfArrival = 0;
 }
 
-bool RenderTexture::saveToFile(const std::string& filename)
+bool RenderTexture::saveToFile(const std::string& filename, bool isRGBA)
 {
-    return saveToFile(filename,Image::Format::JPG);
+    std::string basename(filename);
+    std::transform(basename.begin(), basename.end(), basename.begin(), ::tolower);
+    
+    if (basename.find(".png") != std::string::npos)
+    {
+        return saveToFile(filename, Image::Format::PNG, isRGBA);
+    }
+    else if (basename.find(".jpg") != std::string::npos)
+    {
+        if (isRGBA) CCLOG("RGBA is not supported for JPG format.");
+        return saveToFile(filename, Image::Format::JPG, false);
+    }
+    else
+    {
+        CCLOG("Only PNG and JPG format are supported now!");
+    }
+    
+    return saveToFile(filename, Image::Format::JPG, false);
 }
-bool RenderTexture::saveToFile(const std::string& fileName, Image::Format format)
+bool RenderTexture::saveToFile(const std::string& fileName, Image::Format format, bool isRGBA)
 {
     CCASSERT(format == Image::Format::JPG || format == Image::Format::PNG,
              "the image can only be saved as JPG or PNG format");
+    if (isRGBA && format == Image::Format::JPG) CCLOG("RGBA is not supported for JPG format");
     
     std::string fullpath = FileUtils::getInstance()->getWritablePath() + fileName;
     _saveToFileCommand.init(_globalZOrder);
-    _saveToFileCommand.func = CC_CALLBACK_0(RenderTexture::onSaveToFile,this,fullpath);
+    _saveToFileCommand.func = CC_CALLBACK_0(RenderTexture::onSaveToFile, this, fullpath, isRGBA);
     
     Director::getInstance()->getRenderer()->addCommand(&_saveToFileCommand);
     return true;
 }
 
-void RenderTexture::onSaveToFile(const std::string& filename)
+void RenderTexture::onSaveToFile(const std::string& filename, bool isRGBA)
 {
     Image *image = newImage(true);
     if (image)
     {
-        image->saveToFile(filename.c_str(), true);
+        image->saveToFile(filename.c_str(), !isRGBA);
     }
 
     CC_SAFE_DELETE(image);
diff --git a/cocos/2d/CCRenderTexture.h b/cocos/2d/CCRenderTexture.h
index 09ba451df7..187acc18b3 100644
--- a/cocos/2d/CCRenderTexture.h
+++ b/cocos/2d/CCRenderTexture.h
@@ -103,12 +103,12 @@ public:
     /** saves the texture into a file using JPEG format. The file will be saved in the Documents folder.
         Returns true if the operation is successful.
      */
-    bool saveToFile(const std::string& filename);
+    bool saveToFile(const std::string& filename, bool isRGBA = true);
 
     /** saves the texture into a file. The format could be JPG or PNG. The file will be saved in the Documents folder.
         Returns true if the operation is successful.
      */
-    bool saveToFile(const std::string& filename, Image::Format format);
+    bool saveToFile(const std::string& filename, Image::Format format, bool isRGBA = true);
     
     /** Listen "come to background" message, and save render texture.
      It only has effect on Android.
@@ -222,7 +222,7 @@ protected:
     void onClear();
     void onClearDepth();
 
-    void onSaveToFile(const std::string& fileName);
+    void onSaveToFile(const std::string& fileName, bool isRGBA = true);
     
     Mat4 _oldTransMatrix, _oldProjMatrix;
     Mat4 _transformMatrix, _projectionMatrix;
diff --git a/cocos/platform/ios/CCImage.mm b/cocos/platform/ios/CCImage.mm
index 71ebce91a2..ab288f8f65 100644
--- a/cocos/platform/ios/CCImage.mm
+++ b/cocos/platform/ios/CCImage.mm
@@ -42,7 +42,9 @@ bool cocos2d::Image::saveToFile(const std::string& filename, bool isToRGB)
     bool saveToPNG = false;
     bool needToCopyPixels = false;
 
-    if (std::string::npos != filename.find(".png"))
+    std::string basename(filename);
+    std::transform(basename.begin(), basename.end(), basename.begin(), ::tolower);
+    if (std::string::npos != basename.find(".png"))
     {
         saveToPNG = true;
     }