I am trying to load an Gdiplus bitmap of 8 bit depth to an opencv mat. the image is in greyscale.Greysacle Image of 8bit.

this is the VC++ code snippet i am using to convert it into cv::mat. But using this when i convert i am getting a faded image of the original image in the cv::mat. What could be the reason?

// Creating the m_Bitmap 
Gdiplus::Bitmap bit(152, 152, PixelFormat8bppIndexed);
m_Bitmap = bit.Clone(0, 0, bit.GetWidth(), bit.GetHeight(), PixelFormat8bppIndexed);

// Later Different paths are added to this bitmap

// Converting this bitmap to cv::mat
Gdiplus::PixelFormat format = m_Bitmap->GetPixelFormat();
if (format == PixelFormat8bppIndexed)
{
            Gdiplus::BitmapData bitmapData;
            Gdiplus::Rect rect(0, 0, width, height);
            m_Bitmap->LockBits(&rect, Gdiplus::ImageLockModeRead, format, &bitmapData);
            
            cv::Mat nmat = cv::Mat(height, width, CV_8UC1, static_cast<unsigned char*>(bitmapData.Scan0), bitmapData.Stride).clone();
}

Original bitmap Image (m_Bitmap)

enter image description here

This is the image preview of cv::mat nmat
enter image description here

I need to have the same image as the source to be loaded into the cv::mat but that is not happening here.