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Old 02-26-2011, 07:06 PM   #1
Bonex
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Question Any idea how PB 90x chooses cover thumbnails

Hi there!

Is there anybody who knows how the new models choose the image to use as cover thumbnail in Files/Library view?
Of the epubs I have, there are many showing the correct image, but there are some that show some random image taken from the ebook.
I tried to compare the opf files of those that work with those that don't but I can't find anything wrong. Both seem perfectly fine to me.

Last edited by Bonex; 02-26-2011 at 07:08 PM.
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Old 02-26-2011, 07:50 PM   #2
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Most probably: by chance

No, serious. I've given up to find out a reason why this happens, cause I have absolutely no idea. At first I thought it might be because some books use Calibre imported covers and others had their own, but has to be something else.
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Old 02-27-2011, 10:03 AM   #3
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I discovered that if you put into the epub an image with the filename ending with "cover.jpg" it is used as thumbnail even if it's not declared into the opf.
This does not explain the random right/wrong image anyway because in those ebooks I checked the cover are always called in the form Author_ISBN-number_etc.jpg

EDIT: No... my mistake. It has to be declared and what matters is the position of its declaration (see below).

Last edited by Bonex; 02-28-2011 at 01:06 PM.
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Old 02-27-2011, 11:53 AM   #4
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I did extensive testing of this mystery with epubs on my PB360. I eventually found an answer which has had a 100% success rate so far on a PB360 running firmware v15.2.

I found that if I examined the <manifest> section in the .opf file inside the epub, the epubs which didn't work invariably had the cover image item a long way down the manifest list (around 50 or more). It's almost as if the PB stopped looking for a cover part-way through the manifest. If I moved the cover image item to the top of the manifest list the problem was fixed.

However, if you've already sent the epub to the reader, it is not enough to just resend the epub, to overwrite the original, because the PB "remembers" the old thumbnail (or lack thereof). You first need to delete the book from the PB before connecting to the PC, so that the PB deletes the old thumbnail. If you then reconnect and resend the epub the thumbnail is extracted correctly.

I didn't find that the name of the cover image mattered at all, just its position in the manifest

Of course, PB firmware being as 'quirky' as it is, may mean that each different version has its own solution to this problem
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Old 02-27-2011, 02:07 PM   #5
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As I said, most probably by chance
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Old 02-27-2011, 04:46 PM   #6
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Originally Posted by troll05 View Post
As I said, most probably by chance
You may mock. I have total confidence that I have the answer to MY particular PB problem.
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Old 02-27-2011, 05:10 PM   #7
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I'm sure you are right, but with computers you never know...
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Old 02-28-2011, 12:51 PM   #8
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Quote:
Originally Posted by jackie_w View Post
I found that if I examined the <manifest> section in the .opf file inside the epub, the epubs which didn't work invariably had the cover image item a long way down the manifest list (around 50 or more). It's almost as if the PB stopped looking for a cover part-way through the manifest. If I moved the cover image item to the top of the manifest list the problem was fixed.
Yesss!! That's it! I tried it and it works!!
No need to delete the file first with the 902. I have simply overwritten it and when I disconnected the reader from the PC the covers were there.
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Old 03-01-2011, 12:03 AM   #9
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Quote:
Originally Posted by Bonex View Post
No need to delete the file first with the 902. I have simply overwritten it and when I disconnected the reader from the PC the covers were there.
That's interesting. Sounds like there's been an improvement to the firmware. Perhaps the 902 detects that the book is newer than the thumbnail and automatically re-extracts it. I wish my PB360 did that.

Last edited by jackie_w; 03-01-2011 at 12:05 AM.
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