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load bmp and save as compressed dds (dxt1)

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I'm trying to do something which I thought would be simple. All I want to do is load in a bmp image and save it back out as a dxt1 compressed dds image, but the save function call is failing (D3DERR_INVALIDCALL).
result = D3DXCreateTextureFromFileEx(
	pDevice,
	"c:\\wiiart\\txd\\128x128x32.bmp",
	D3DX_DEFAULT,
	D3DX_DEFAULT,
	D3DX_DEFAULT,
	D3DUSAGE_DYNAMIC,
	D3DFMT_DXT1,
	D3DPOOL_DEFAULT,
	D3DX_DEFAULT,
	D3DX_DEFAULT,
	0,
	&imageInfo,
	0,
	&pTexture);


result = D3DXSaveTextureToFile(
	"c:\\wiiart\\txd\\saved.dds",
	D3DXIFF_DDS,
	pTexture,
	0);
			
Can anyone help? Cheers.

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