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Old 27th Jul 2021, 3:57 pm   #13
Join Date: Dec 2007
Location: Haarlem, Netherlands
Posts: 3,308
Default Re: Scanning of Manuals & Circuit Diagrams?

1 bit monochrome is mostly out of the question unless you want the scan either to loose lots of detail or you're willing to do pixel and palet editing by hand to reduce better source material; it's not a goal that should be targeted unless you have extensive experience in editing.

4 bit is achievable without too much trouble and 8 bit grey scale is just fine for mixed content (text and pcb layouts or other simple grey scale illustrations.

PDF compression should be set to PNG, or a PDF should be created from PNG source material.
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