If Picture selected have white background, Welcome Information text is displayed while Copyright text is not displayed or not visible.

If Solid Color is set to white, Welcome Information text is not displayed or not visible while Copyright text is displayed.

On the other hard, when Terms of Service is enabled on a white background picture, the color of the text "I agree" turns to white (visible and can be read).

If Solid Color is set to white, the text "I agree" turns to color black, making it visible, no matter the color of the background.

I guess this color auto adjust will be implemented on Welcome Information and Copyright so they can be read/visible whatever the color of the background is.