22 Sep
2005
22 Sep
'05
1:14 p.m.
Re:
1) Things that are mostly schematics.
2) Things with a large text component that I might want to try to OCR.
Questions:
a) What resolution should I use for these two things?
For OCR, it may depend on the OCR software, but for almost everything I have
found that 300 dpi and gray-scale (8 bits per pixel) JPEG works best.
Grayscale is definitely better than black-and-white (1 bit per pixel) for
reproduction that is indistinguishable from the original, but for some OCR
software, black-and-white line art (1 bit per pixel) may work better.
22 Sep
22 Sep
3:16 p.m.
>>>> "Barry" == Barry Watzman
<Watzman at neo.rr.com> writes:
Barry> Re:
> 1) Things that are mostly schematics.
>
> 2) Things with a large text component that I might want to try to
> OCR. Questions:
>
> a) What resolution should I use for these two things?
Barry> For OCR, it may depend on the OCR software, but for almost
Barry> everything I have found that 300 dpi and gray-scale (8 bits
Barry> per pixel) JPEG works best. Grayscale is definitely better
Barry> than black-and-white (1 bit per pixel) for reproduction that
Barry> is indistinguishable from the original, but for some OCR
Barry> software, black-and-white line art (1 bit per pixel) may work
Barry> better.
I agree with you that grayscale is going to work better with many OCR
implementations (because it effectively provides anti-aliasing).
But avoid JPEG like the plague. JPEG is designed ONLY for
photographic images, and is ONLY fit to be used for those. It WILL
butcher any image with "hard edged" content -- text or line graphics.
You need TIFF or PNG (or even GIF) for that. Not only will that
protect the quality of your scans, but it will also generally compress
better (smaller output files) than JPEG.
paul
7041
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7041
days old
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