Using tiffcp to change the compression from lzw to g4 more than doubles
the size to 1.6 MB. That's for a single page.
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Something is really broken with what you are doing. A normal 400dpi G4
compressed text page should be 50 - 100k.
Scanning though the sizes of a manual I just scanned, it's closer to
15 - 50k / page.