Which of the following statements is false?
1) Digital processing cannot compensate for insufficient penetration of the original remnant x-ray beam
2) Digital processing cannot always compensate for very extreme (10 times) overexposure in the original remnant x-ray beam
3) Scatter radiation in the original remnant x-ray beam always results in a dark image after digital processing
4) Digital processing cannot always compensate for inadequate signal-to-noise ratio (SNR) in the original remnant x-ray beam