This is one of those weird artifacts of imaging that is still true on computers today. Applying some sorts of a blur to an image can make it actually appear sharper.
Vast improvement in TV pictures is predicted by Westinghouse if the “spot wobble” method of horizontal line scanning is introduced. TV viewers are all familiar with the black and white lines that make up the picture. A viewer too close to the receiver can see the lines (ten feet is optimum for a 24″ screen). This can be remedied by slightly wobbling the scanning spot in the picture tube so that a broader line is rendered for better quality at a closer viewing distance.
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