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Old 03-08-2006, 09:50 AM   #1
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Default converting color scan to B&W

I have a bunch of line-art pages (drawings, typewriting, handwriting) that were offset printed in black ink on a textured pumpkin-colored stock.

I need to scan them and turn them into B&W (for the web; but who knows about the future and these are somewhat fragile, so I am working large), but I’m not positive how to proceed.

So far I tried this:
  • scan at 300dpi in 24bit color (and save it)
  • convert to greyscale in Photoshop (and save it)
  • use Levels to make the background white
  • change Mode to bitmap using Threshold 50%
That leaves me with a huge and bumpy image; reducing it to its original physical size should fix the bumps, but I wonder whether I should have adjusted the size when I changed mode. Or whether I am going about this all wrong.

This was an easy one: some large-ish handwriting and a big drawing. Some of the others are typescript (some with ribbon typewriter, even); one has better typewriting (electric typewriter) but it has been reduced to 50%.

Any advice before I get in over my head? Thanks.

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