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Adjust the --resolution and --mode as required (if these options are available for your scanner).
The size options (-x, -y, -imageheight, -imagewidth) are for US letter paper. For A4, I think the command would be:
scanimage -p --resolution 250 --mode Gray -x 210 -y 297 | pnmtops -imageheight 11.7 -imagewidth 8.3 | ps2pdf - output.pdf
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