The spritebatch.draw overloads only accept the Color class as the color parameter for the tint, and the Color class only stores 8bits in each color channel.
What I want to do is tell the spritebatch to draw a sprite with a tint color that is more accurate, such as 16 bits in each color channel instead of 8.
How does one do this?
By writing your own sprite batcher using the API's primitive rendering functionality. The built-in XNA SpriteBatch class is designed to cover the majority of general-case scenarios; it's rare to need greater than 8 bits per color channel when rendering 2D graphics, so it doesn't have that option.
Is there a reason you need greater than 32-bit color precision? What exactly are you trying to accomplish?
