Quote:
Originally Posted by DSpider
You should look up SVG (Scalable Vector Graphics). ...
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Since the OP said this is for a Kindle (his step #6) he should ignore SVG.
OP: You step #1 needs to be rethought. The scanning resolution needs to be chosen based on the physical size of the original and should likely change from original to original if their sizes differ. You need to "over-scan" so that you have more pixels than you need in your final image.
I would suggest scanning so that you initially have an image 4x you final desired size. If 600x800px is your target then scan so that you initially have a 2400x3200 image. If the original is 3x4" you would need a scanning resolution of 800dpi, if its 6x8" you would need only 400dpi. When you downsample latter in the process you need to do so choosing appropriate methods so that you achieve the anti-aliasing that you need.
You may find that replacing the scanned text with new, possibly larger or bolder, text while editing the image will work better than trying to reproduce the original in the scan.