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Scanner: FileFormat.

Hi all,
 
Does somebody know a bit what's the best format / compression to use when scanning mainly letters (black & white)?
Scanned documents are saved to disc (more pages in one document are possible), after that some will be OCR-ed.
 
I know that there's probably not one good answer, but I would like to start with something good (to test / demo), and perhaps to change afterwards.

Other advise / comments in this area are very welcome!

By the by, at the moment I'm developing with the ocx components I imported from Imaging for Windows.

I was thinking about using tiff, but there are some possible compression settings (Huff, packed, LWZ), are those all Tiff formats?

Thanks in advance,
 
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florisb
Asked:
florisb
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1 Solution
 
TheNeilCommented:
PCX would give you great compression and no loss in quality when dealing with B&W images (i.e. text). It's also easy to write your own load and save routines for it

The Neil
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LischkeCommented:
TIFF is the usual format when it comes to scanning and it has all you need I think. There are also many compression formats available, like:

- dump mode
- CCITT modified Huffman RLE
- CCITT Group 3 fax encoding
- CCITT Group 4 fax encoding
- Lempel-Ziv & Welch
- 6.0 JPEG
- JPEG DCT compression
- Next 2-bit RLE
- #1 w/ Word alignment
- Macintosh RLE
- ThunderScan RLE
- codes 32895-32898 are reserved for ANSI IT8 TIFF/IT <dkelly@etsinc.com)
- IT8 CT w/padding
- IT8 Linework RLE
- IT8 Monochrome picture
- IT8 Binary line art
- compression codes 32908-32911 are reserved for Pixar
- Pixar companded 10bit LZW
- Pixar companded 11bit ZIP
- Deflate compression
- compression code 32947 is reserved for Oceana Matrix <dev@oceana.com>
- Kodak DCS encoding
- ISO JBIG

Since you are going for OCR I think the FAX encoding is the best choice for you (black&white), but I don't know for sure if it is lossless.

Ciao, Mike
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florisbAuthor Commented:
Thanks so far.
Mike, you don't happen to know whether the Imaging for Windows ocx components support the suggested Tiff compression?

Tiff? Check: http://www.libtiff.org/

Sincerely,
Floris.
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LischkeCommented:
Yep, I just tested the Wang imaging with the sample images for the TIFF library. It does crash on various formats but it can handle G3 fax encoding.

Ciao, Mike
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florisbAuthor Commented:
Hi Mike,

Thanks, great. My only problem now is that I'm doing 25 things at the same time.

Would you mind to send me your (test?) project using Wangs ocx's? Would be great: florisb@satl.com

Neil, also thanks again. I'll stick with TIFF. I'm on this TWAIN maillist and have contact with some people that know a lot about TIFF.

By the by; three years ago I made an application that was placed after scanning and before OCR; it detected whether area's in a TIFF where placed horizontal. I not, it replaced this area in the TIFF to a 100% horizontal position. Was very complicated... ...you know what I mean if you know how a TIFF is build bitwise, all those 'bands'.
Well, never mind, social computer talk.

Good luck and please do post more info if you have! Or contact me in a few weeks if you like to know what I did with it.

Greetings,
Floris.
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florisbAuthor Commented:
I hope you don't mind to post or send  the code.
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LischkeCommented:
I don't have a test project. There's an application (wangimg.exe) which uses the ocx and I have used the Imaging app to open all of those pictures.

Ciao, Mike
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florisbAuthor Commented:
those components work together in a shitty way... but I'll manage.

Floris.
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florisbAuthor Commented:
Was that a joke by the by...?
....let's hope Windows Imaging uses it's own components and it's own improved versions.

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