how to display a gradation image?

Hi?
I'm trying to display a 24bit bmp image which has gradation part in it.
The image can be shown correctly. But the gradation part is shown as moire.
Of course, my target device support 24bit display.

My code is like following.

CClientDC dc(this);

HGDIOBJ pOldBitmap;
CDC bitmapDC;

CMemDC m_memDC(&dc, &clientRect);
m_memDC.FillSolidRect(&clientRect, RGB(76,85,118));
bitmapDC.CreateCompatibleDC(&dc);

pOldBitmap = bitmapDC.SelectObject(jhBitmapBK );
m_memDC.BitBlt( 0, 0, BG_SIZE_WIDTH, BG_SIZE_HEIGHT,
&bitmapDC, 0, 0, SRCCOPY );
bitmapDC.SelectObject(pOldBitmap);
pOldBitmap = NULL;

What's matter?
.

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