12.1.1.3.1-8 Superposed Characters for Projected Displays

The contrast polarity of superposed characters should be appropriate for the method of projection. Additional Information: For subtractive superposition (at the source), characters should be presented as dark markings on a transparent background. For additive superposition (at the screen), characters should be presented as light markings on an opaque background. Colored markings against colored backgrounds of comparable brightness should be avoided.5908