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Old 04-04-2008, 01:47 PM   #1
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Post Yet Another Thread on Page Numbers (when will it stop?)

If you want an ergonomic reader that works well for holding in one hand, I highly recomend the 505. It is very nice for holding in one hand for reading/page turning. And as you may have read, people want proper page numbers which only Sony has.
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Old 04-04-2008, 02:17 PM   #2
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And as you may have read, people want proper page numbers which only Sony has.
The eBookwise 1150 and REB 1200 have a flawless page number display, as well!
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Old 04-04-2008, 02:56 PM   #3
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The eBookwise 1150 and REB 1200 have a flawless page number display, as well!
Likewise Iliad has a very accurate page number display.
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Old 04-04-2008, 03:24 PM   #4
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Likewise Iliad has a very accurate page number display.
Really? I have heard that there is no proper implementation of page numbers in an mobipocket device, or are you saying that pdf files are accurately displayed with page numbers.

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Old 04-04-2008, 04:09 PM   #5
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The iLiad has exactly the same page numbering bugs with Mobi files that every other Mobi device does. They appear to be inherent in the Mobi reader itself.
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Old 04-04-2008, 05:20 PM   #6
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Is this the "progress bar" thing? Kindle seems to have a modified version of that idea. I'm guessing that they just took the way mobi calculates progress and made it a bit more transparent to the user by telling you the location number.
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Old 04-04-2008, 05:33 PM   #7
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Yes, exactly. There's nothing wrong with the progress bar; the issue is with the actual page number that some version of the Mobi Reader also display. It's not terribly accurate.
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Old 04-04-2008, 05:55 PM   #8
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Yes, exactly. There's nothing wrong with the progress bar; the issue is with the actual page number that some version of the Mobi Reader also display. It's not terribly accurate.
The progress bar display the same thing as the page number I would assume so the progress bar is not terrible accurate either.
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Old 04-04-2008, 05:57 PM   #9
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The progress bar display the same thing as the page number I would assume so the progress bar is not terrible accurate either.
the progress bar is just the number of bytes you have read divided by the number of bytes in the file. It is not linear is there are images in the file.

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Old 04-04-2008, 06:06 PM   #10
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the progress bar is just the number of bytes you have read divided by the number of bytes in the file. It is not linear is there are images in the file.
Yes, and I think the page number you jump to is calculated in the same way.

I do not think it is the numer of bytes you have read but the number of bytes up to the current file position which is not the same for an HTML file.
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Old 04-04-2008, 06:14 PM   #11
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Yes, and I think the page number you jump to is calculated in the same way.

I do not think it is the numer of bytes you have read but the number of bytes up to the current file position which is not the same for an HTML file.
The book I did my "paging vs. jumping" test on was illustrated, and there were a couple of pictures in the bit I paged through. I wonder if that might have contributed to the rather extreme error I found (14 pages in 52)? I'm about to go to bed now, but I'll repeat the experiment in the morning with a book that doesn't have any pictures, and see if it's any more accurate.
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Old 04-04-2008, 07:14 PM   #12
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The book I did my "paging vs. jumping" test on was illustrated, and there were a couple of pictures in the bit I paged through. I wonder if that might have contributed to the rather extreme error I found (14 pages in 52)? I'm about to go to bed now, but I'll repeat the experiment in the morning with a book that doesn't have any pictures, and see if it's any more accurate.
The image in the MobiPocket data is just a pointer to a record so it should not matter but it is probably worth testing to be sure.
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Old 04-05-2008, 02:05 PM   #13
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Yes, and I think the page number you jump to is calculated in the same way.

I do not think it is the numer of bytes you have read but the number of bytes up to the current file position which is not the same for an HTML file.
Yes, almost. The progress bar is exactly that but the page number is skewed a bit in that the reader has knowledge of where you currently are in the book if you got there from reading from the beginning. It counts the pages as you go so where you are is accurate. It also remembers the boundaries back a few pages so you can backup and it will be accurate. At least that is the way the MobiPocket reader itself works. I can't say for third party implementations. Given the page starting location can be referenced exactly to a starting point in the file the jump can be calculated slightly more accurately that just distance from the beginning of the file. This is what provides a false sense to many people that it is accurate. You really have to test it out to know for sure. A few jumps from approximated to approximated locations will tell the tale.

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Old 04-07-2008, 09:30 AM   #14
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Yes, almost. The progress bar is exactly that but the page number is skewed a bit in that the reader has knowledge of where you currently are in the book if you got there from reading from the beginning. It counts the pages as you go so where you are is accurate. It also remembers the boundaries back a few pages so you can backup and it will be accurate. At least that is the way the MobiPocket reader itself works. I can't say for third party implementations. Given the page starting location can be referenced exactly to a starting point in the file the jump can be calculated slightly more accurately that just distance from the beginning of the file. This is what provides a false sense to many people that it is accurate. You really have to test it out to know for sure. A few jumps from approximated to approximated locations will tell the tale.
Yes, and the tale for the Cybook is that it is totally inaccurate.

What do you mean that the jump can be calculates more accurately? If you have html code which contains comments or other markup that are not displayed then it will not be possible to calculate the jump accurately at all if the jump is intended to be pages.
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Old 04-07-2008, 09:51 AM   #15
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Yes, and the tale for the Cybook is that it is totally inaccurate.
I think that to say it's "totally inaccurate" is putting it a little strongly. It seems to routinely have an error of about a dozen pages, but that's an absolute error, not a relative one. eg if you jump, say, 80% of the way through a book, you'll end up within about a dozen pages of the "true" 80% point. That's good enough for many purposes.

It would be a lot better described as an approximate positioning mechanism rather than an exact "page count", however.
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