Save as PDF: Read Less Image Data than Expected

PROBLEM:

- set output type to 'text and image'
- click on save to file
- choose PDF
- scan, adding pages until done
- try to open in Acrobat 4.0 Reader or Full version
- get error message: Read Less Image Data than Expected
- portions of image are replaced by a black box (about 1/4 of scanned page)

NOTES
- Scanning TO Acrobat works correctly (this simply sends scanned image to Acrobat)
- TWAIN acquistion from Acrobat works correctly

CONFIGURATION:

- HP 6390C with HP Precision Scan Pro 2.0 (1998)
- Windows NTSP4
- SCSI
- Acrobat 4.0 Installed (full application)

CONTACT:

John G. Faughnan
Product Manager - ClinChart.com
Abaton.com A Division of McKessonHBOC
office: 612-814-7160
email: jfaughnan@abaton.com
web: www.abaton.com

jfaughnanAsked:
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MadMaxCommented:
open copy utility (scan to printer button...second button from left).  in lower right corner look for printer set up..open that.  change printer to PDF writer.  say ok.  click copy.  save as box opens...give file a name...copy utility prints it to a PDF file.  mulitple page scans through ADF available.
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jfaughnanAuthor Commented:
This is a truly extraordinary tip, well worth the 75 points.

It does not answer the original question precisely, but it may do the job.

I'm actually wondering if the original problem is not due to a SCSI problem. I use an Adaptec 2940 card; this is a much higher performance card than the default card that ships with the scanner. It may be that data congestion occurs more often with the scan to file setting than with other scanning functions, triggering SCSI failure and data corruption.
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jfaughnanAuthor Commented:
Didn't precisely answer the question, but provided a BETTER approach to the problem I was trying to solve.
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MadMaxCommented:
That is possible. The 2940 card may be transmitting data faster than the software can handle it correctly. In the scsi bios it may be able to adjust the data transfer rate for the SCSI ID the scanner is using. If it is possible, try something between 10 and 20...it is probably set to 40 or above by default.
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jfaughnanAuthor Commented:
Thanks! It turns out the card maxes out at 20 (old version), and in any case it was set to 10.

I did speak with an HP SCSI specialist. He's seen speed problems at 60-80MB, but 10MB with the 2940 should be rock solid. I'll try another cable; maybe the one that was shipped with the scanner is faulty, but since all other modes work correctly I doubt it's a SCSI problem.

I also ran (his suggestion) ASPICHK (or somesuch) from Adaptec to confirm that all the NT ASPI drivers were the correct versions and properly matched. He also suggested installing SP5 and that he recommends redoing service packs following NT scanner software installs(!).

I'll try an install on a fairly 'pure' Win98 USB box next week to see if the problem appears there.

Right now I'm suspicious of a DLL conflict between the HP scanner software and Acrobat 4 (full installation, not just reader).

john
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MadMaxCommented:
I have heard other people say that the software performs flawlessly in Acrobat 3(full version) but has a few minor problems in Acrobat 4(full version). I have never tried to use my scanner with Acrobat 4 so I cannot speak from personal experience on this one. As to redoing the service pac after installing a scanner in NT 4.0, I fully agree with that as do I agree with running the ASPICHK.exe from Adaptec. Best of luck to you in figuring out the dll conflict, that can be a challenge.
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wmcevoyCommented:
I have had the same error "Save as PDF: Read Less Image Data Than Expected" combined with black boxes on some pages using an USB port.  Considering getting Acrobat as a work around.  I assume that is where the "PDF writer" printer comes from.
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jfaughnanAuthor Commented:
Yes, the "PDF writer" printer is installed with Acrobat. Having a second report of this problem is invaluable. You've ruled out an interaction with Acrobat 4 and an obscure SCSI problem as contributing factors. Also, since you are using USB, you've ruled out NT as a contributing problem!

All in all, an excellent contribution.

This looks more and more like a straightforward HP ScanSoft bug. I'll pass information on to the HP support staff I've been working with. They've been quite helpful.
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wmcevoyCommented:
I just found the "PDFwriter" comes with and is installed by the Adobe PhotoDeluxe Business Edition that is on the HP 6300C CD (that comes with the scanner).
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wmcevoyCommented:
Using the COPY utility (to PDFwriter) is great improvement for me too.  I have been scanning pages of handwritten calculations.  The COPY is significantly faster, produces files about 1/10 of the SAVE (in the PrecisionScan program) and at better resolution (300 vs 200 dpi).

The trade off is no OCR - which I believe is the troublemaker causing the original errors.  I was disapointed that OCR could not be turned off in PrecisionScan and still use the ADF.
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jfaughnanAuthor Commented:
I hadn't realized that there was no way to turn off the OCR when PrecisionScan generates PDF. That's a drag! The implementation of PDF generation in PrecisionScan Pro is pretty disappointing -- probably due to having to design the s/w for a very non-technical market.

Between the settings for copy and the settings for PDF writer there's quite a bit of flexibility with this approach.

I had not realized that PDFWriter was installed with PhotoDeluxe; that means there could still be some incompatibility between the PrescisionScan PDF generation and Adobe's PDF generation (DLL conflict?).

HPs engineers have replicated the problem, so a solution should not be too far off (though a s/w patch may take a while yet).

john
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wmcevoyCommented:
I had the problem before installing PhotoDeluxe, although Acrobat Reader was on the system.  Don't have any idea of possible DLL issues .  I just installed PhotoDeluxe to get the PDFwrither for MadMaxes workaround.  Turning off the OCR would be my first choice.
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