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I have a black-and-white diagram (floor plans) scanned from a printout. It's mostly OK, but some of the lines are visibly faded or blurred in places, so it "looks" scanned.

I've tried various options in Paint.NET so far without any success. I could download any free software that would do the job. I could probably get access to Photoshop as well (not sure which version), but I wouldn't even know where to start with that.

Is there an easy way to make them into clear, sharp lines?

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In Photoshop you could try Filters > Sharpen > Sharpen Edges. Along with that, to make it a little more clear, go to Image > Adjustments > Levels.. and play with that to remove blurry edges and darkening the sharp lines. –  poepje Jun 11 '12 at 8:45
    
One thing though; you say 'black-and-white diagram (floor plan)' but I suppose you meant something like 'blueprint' (instead of diagram)? Otherwise I might be understanding the question wrong. –  poepje Jun 11 '12 at 8:46
    
Can you post a sample image? –  e100 Jun 11 '12 at 11:18
    
Thanks, poepje! I ended up getting a clean digital copy of the image in the end, but it's good to know what to try if I ever have to do this again. –  EMP Jun 13 '12 at 1:51
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@poepje this old question doesn't have any answers, but yours is valid I think. I encourage you to post it as an answer! –  JohnB Aug 11 '13 at 23:39
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In Photoshop you could try Filters > Sharpen > Sharpen Edges. Along with that, to make it a little more clear, go to Image > Adjustments > Levels.. and play with that to remove blurry edges and darkening the sharp lines.

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