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Does CreateRenderImage() always create a black opaque image? Is it at all possible to create sprites with a transparent background using this command. All sprites created using this command just have a black opaque background with no alpha information (even if the original sprite pasted onto the render image did)

The alpha values in the original sprite aren't preserved because they are used to determine how the sprite is placed onto the rendered image. If you placed 2 overlapping sprites into the image, you would not expect the overlapping parts of the original sprite to be overwritten with the alpha values & colours of the second sprite, you would expect the pixels to be merged according to the alpha values of the second sprite drawn. So that behaviour is correct.

I don't believe you can set the rendered image as transparent to start with either (Which would solve the problem).

You could use SetImageTransparentColor(), but this is a crude solution where the alpha value is either 0 or 255 and nothing in between. This only appears to work when the image is used as a sprite, and can't be used to set the image as initially transparent before you draw sprites to it.