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Blending With Only 1 color

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Hi I just read the NeHe blending tutorial and the stuff they teach you there is ok if you want the wholde image to be transparent but what say I had a texture (made in paint) that was white with a line in the middle. Where it was white I wanted to see through but not where the line was, how would I make it so it is fully transparent only where the image is white (or any color) and so i wouldn''t see any white either? Thanks.

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The most general solution that works is using an alpha channel for your texture.

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