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Newspapers are printed with screens set at different angles. For this reason, when you scan them, you have to use a “descreen” feature of your scanner software.

 Also, because of the way that newspaper is printed, it should be scanned at 150 dpi. Hold a magnifying glass over a newspaper and you’ll see the pattern of spots. If you scan at high resolution, the result will be spots, not solids.

 Here is an example of scans with and without screens, and at 150 and 300 dpi. The levels have been adjusted, and some colors corrected. The left side is 150 dpi, the right side is 300 dpi. The spots are clear to see. The top row is not descreened, the bottom row is. The bottom left image is the one that you can restore most easily.