I can't get 8 bit grayscale DICOM image.

Hi.
I'm making a DLL. This DLL convert DICOM Image to Bitmap.

But, I can't get 8 bit grayscal DICOM image.
DICOM image is displayed as monochrome or 2,4 bit image.

I use L_DicomGetImage and L_ConvertToDDB.
but, image is always monochrome(black or white, threshold is 254.)

How can i get grayscale DICOM image?

my source code is...
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HBITMAP hBitmap;

result = L_DicomGetImage(hDS, pElement, Bitmap, sizeof(BITMAPHANDLE), i, BitPerPixels[nBitPerPixel], nOrder, Flags, NULL, NULL);

hBitmap = L_ConvertToDDB((HDC)(pDC.ToPointer()), Bitmap);
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If the original pixel data is extended grayscale, that type of grayscale is not supported by Windows DDBs. If that's the cause of the problem, call the L_GrayscaleBitmap(&LEADBitmap, 8) to convert the image to normal palettized 8-bit gray, then convert it to DDB or DIB.
If that doesn't solve the problem, send us the original DICOM dataset file and a small code project that shows what you're trying to do.
Notes:
1. If you want to send any files, please put them all in one ZIP or RAR file to ensure our servers accept it.
2. Do not use the Preview after attaching as you will lose the attachment.
3. Do not send your full application.