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Old 02-29-2012, 01:14 AM   #16
Rand1956
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I'm looking at buying a P-150 (on sale at Newegg for $215), and the PC Mag review notes:

"One last feature worth mention is a color dropout option in the driver. If you scan pages printed on color paper in black-and-white mode, the pages often come out solid black. The color dropout option can make the text appear—as I proved in my tests with a document printed on orange paper. Even documents printed on white paper often have similar issues with highlighted text, a situation where this feature can come in handy as well."

Might that help with the yellowed pages?
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Old 02-29-2012, 02:51 AM   #17
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Might that help with the yellowed pages?
Yes - I think it will help when you have an even background of one color e.g. dark blue with black characters on it. I found it not so efficient for my special problem with uneven yellowness across the pages plus staines.

As long as either the scanner or the software discriminates well enough in b&w the results are good. My current workflow includes ScanTailor and this proves to be worth the additional effort. I always scan gray now with setting the "brightness" of the scanner to approx. 75% of the scale of the Canon P-150 (whatever the scale means ). This makes the overall appearance of the page a bit pale but helps with the b&w discrimination of ScanTailor at a later point in time. There is one ScanTailor feature i.e. Despeckling that I find more and more useful especially for older books.

As to the P-150: meanwhile I scanned 50 books with an average of 200-400 pages per book without problems. I always use a pack of 40 [edit] sheets to feed into the paper feeder and this still works flawlessly. The failure rate is approx. 5%.

Klaus

Last edited by kbaerwald; 02-29-2012 at 04:13 AM.
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Old 02-29-2012, 08:02 PM   #18
Rand1956
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Impressive, and thanks for the review! I ordered one yesterday and plan to use it much the same way as yours.
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Old 03-01-2012, 05:41 AM   #19
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Originally Posted by kbaerwald View Post
Yes - I think it will help when you have an even background of one color e.g. dark blue with black characters on it. I found it not so efficient for my special problem with uneven yellowness across the pages plus staines.

I always use a pack of 40 [edit] sheets to feed into the paper feeder and this still works flawlessly. The failure rate is approx. 5%.

Klaus
Isn't flawlessly and failure rate of 5% a contradiction in terms?
Maybe I misunderstand you, but if it means that some pages were omitted(not processed) - that is what drove me crazy when using this kind of scanner. Reintegrating the forgotten pages took too much time.

As far as workflow is concerned: do you know "pdfscissors"?
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Old 03-01-2012, 06:56 AM   #20
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Quote:
Originally Posted by Beryll Snyder View Post
Isn't flawlessly and failure rate of 5% a contradiction in terms?
Maybe I misunderstand you, but if it means that some pages were omitted(not processed) - that is what drove me crazy when using this kind of scanner. Reintegrating the forgotten pages took too much time.

As far as workflow is concerned: do you know "pdfscissors"?
Maybe it is the wording - 5 sheets out of 100 are being processed in a way that I have to rescan.

This may be due to

- sheets sticking together (rests of spine glue: I did not cut deep enough)
- major parts of the page are not readable (rescan with other brightness settings)
- scanner pulls sheets in slanted

In the meantime I control the sheets before I process them with the scanner. So I can detect sticked sheets easily. Sometimes the friction between the sheets is pretty high because of a rough surface. It always helps when I shake and reorder the pages before scanning so to make the sheets more "movable".

It is also important to arrange the pack of sheets in a "jagged" way to make the feeding easier.

I think the scanning mechanism is not to blame for the majority of problems.

Last edited by kbaerwald; 03-01-2012 at 07:44 AM.
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Old 03-02-2012, 03:23 AM   #21
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Quote:
Originally Posted by Beryll Snyder View Post
As far as workflow is concerned: do you know "pdfscissors"?
I looked into it yesterday -- pretty good -- if your interest is just reading with an ereader. Very intuitive handling.
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Old 03-02-2012, 08:11 AM   #22
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Quote:
Originally Posted by kbaerwald View Post
Maybe it is the wording - 5 sheets out of 100 are being processed in a way that I have to rescan.

This may be due to

- sheets sticking together (rests of spine glue: I did not cut deep enough)
- major parts of the page are not readable (rescan with other brightness settings)
- scanner pulls sheets in slanted

In the meantime I control the sheets before I process them with the scanner. So I can detect sticked sheets easily. Sometimes the friction between the sheets is pretty high because of a rough surface. It always helps when I shake and reorder the pages before scanning so to make the sheets more "movable".

It is also important to arrange the pack of sheets in a "jagged" way to make the feeding easier.

I think the scanning mechanism is not to blame for the majority of problems.
I think we had this kind of discussion before: with the Plustek Bookscanner I can scan may 6 pages a minute. There is no rescanning, checking for completeness and such. As a consequence little concentration is needed - usually I listen to an adiobook during scanning.
So in the end there does not seem to be a lot of difference between the two procedures.
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