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Draw a quad, why texture is blur?

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I'm using DX9. When i draw a fullscreen quad(two triangles) in a window(600x400), the quad's texture is blur. I think that because the texture size is not 2^n.
But my window is 600x400, not 2^n. I must draw a background that fill the window.
How can i do get rid of texture blur? Thanks all!!!!!

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Can you post a picture of what is meant by "blurred"? Another thing to look into is Minification and Magnification filters and Mip-Mapping, setting these to Linear might give a smoother image when its larger or smaller than its original size.

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