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XNA: Applying SpriteBatch.Draw color (...) to opaque pixels only

I have a sprite loaded from a PNG that has an alpha channel. The image contains an opaque disc and the rest is transparent.

I want to use an argument color

SpriteBatch.Draw(...)

to change the hue of the disc. However, the default blending behavior applies color to the entire sprite, so I end up with an opaque square outline around the shaded disk.

Is there a way to change the blend mode so that transparent pixels don't affect the argument color

?

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I've never seen this happen and I've worked with transparent PNGs like this since XNA. Do you mix 2D and 3D? If so, setting up 3D rendering might confuse SpriteBatch, but I thought SpriteBatch should have set them correctly for you. Maybe there is something wrong with the PNG image you are using?



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Bill, you're right. I forgot to clear the background in one of the PNGs. This question should be removed.



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