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How can I add some RGB value to be transparent?

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I have a plain which has a texture mapped in it. How can I add some RGB value to be transparent?

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No, no, no. I dont mean to use Aplha Blending. It makes the whole object transparent. But I'm making a 2d game using plains. I just want to make lets say black parts of the textured plain to be FULLY transparent. I know this is possible. Anyone?

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I think as in a large area. Like a dessert. Or the Toendra plains (spelling).

	if( FAILED (D3DXCreateTextureFromFileEx(m_pd3dDevice, "main.bmp", D3DX_DEFAULT,D3DX_DEFAULT, 1,0,D3DFMT_A8R8G8B8,D3DPOOL_MANAGED,D3DX_DEFAULT,D3DX_DEFAULT,0xFF000000,NULL,NULL,&m_pCharacter) ) ) 

  m_pd3dDevice->SetTextureStageState(0,D3DTSS_COLOROP,D3DTOP_SELECTARG1);   //D3DTSS_COLORARG1 is set to D3DTA_TEXTURE which means that colour1 is   //entirely taken from the texture and nothing else.   m_pd3dDevice->SetTextureStageState(0,D3DTSS_COLORARG1,D3DTA_TEXTURE);   //Similarly to the COLOR TextureStageStates, the D3DTOP_SELECTARG1   //says to take the result from arguement 1. We set D3DTSS_ALPHAARG1   //to D3DTA_TEXTURE, which makes the alpha value for each pixel comes   //from the alpha component of the texture pixel (texel).    m_pd3dDevice->SetTextureStageState(0,D3DTSS_ALPHAOP,D3DTOP_SELECTARG1);    m_pd3dDevice->SetTextureStageState(0,D3DTSS_ALPHAARG1,D3DTA_TEXTURE);   //The next 2 RenderStates determine how the blending is done.   //The source is our object, destination is the drawing surface.   //SRCBLEND specifies that the final colour should be 50% (because   //that''s what we set our souce alpha to) from our source and 50%   //(INVSRCALPHA, 100%-SRCALPHA(50% in this case))    m_pd3dDevice->SetRenderState(D3DRS_SRCBLEND,D3DBLEND_SRCALPHA);   m_pd3dDevice->SetRenderState(D3DRS_DESTBLEND,D3DBLEND_INVSRCALPHA);   //This enables Alpha Blending    m_pd3dDevice->SetRenderState(D3DRS_ALPHABLENDENABLE,TRUE);        m_pd3dDevice->SetTextureStageState( 0, D3DTSS_TEXTURETRANSFORMFLAGS, D3DTTFF_COUNT2 );