: How can I sharpen the lines in a scanned diagram? 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
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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I notices that with a grayscale images is useful:
Color > Curves, usually an S curve, similar to increase contrast. Touch on gray points on image to choose what levels you will convert to white/black.
Filter > Enhance > Unsharp Mask... and play with values
Filter > Enhance > NL Filter... and play with values
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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