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TakeHighResScreenShot SetMaskEnabled

Hello guys. I want to screenshot but also with SetMaskEnabled but I don’t know why the saved image has the background green.
If I use TakeHighResScreenshot BP it’s working, but in C++ I have a green bg.

void AJsonActor::SavePic()
{
	
	FString Folder = TEXT("F:/img/");
	FString PNGExtension = TEXT(".png");
	FString Path = Folder.Append(ZombieType).Append(PNGExtension);
	
	UGameViewportClient * GameViewport = GEngine->GameViewport;
	if(GameViewport)
	{
		FHighResScreenshotConfig &HighResScreenshotConfig = GetHighResScreenshotConfig();

		
		FViewport *Viewport = GameViewport->Viewport;
		if(Viewport)
		{

			HighResScreenshotConfig.SetFilename(Path);
			HighResScreenshotConfig.SetMaskEnabled(true);
			HighResScreenshotConfig.SetHDRCapture(true);
			
			GScreenshotResolutionX = 2048.0f;
			GScreenshotResolutionY = 2048.0f;

			
//			GetHighResScreenshotConfig().SetFilename(Path);
			Viewport->TakeHighResScreenShot();
		}
	}
}
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