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Pearson Knowledge Base eText Production eText Production Discussions iPad, Android & Mobile Issues
Campbell Biology 9 eText not working on iPad?Change Subscription
Original Message (Posted just now 05:09pm Jan 18, 2012 EST)
by Lauren Keats (Posts: 4) (IP: IP not logged)
Hi Erik
We seem to be having trouble with one of our etexts timing out when being used on the iPad. Our IT guys suspect that the etext itself is too big for use on the iPad.
Text details: Parent ISBN10: 1442531762 Parent ISBN13: 9781442531765 Title: Campbell Biology Ninth Australian Version Author: Reece Edition: 9 Copyright: 2012 ISBN10: 1742064132 ISBN13: 9781742064130 Global Book ID: CM12301699 Book ID: 5799
Could you please help to shed some light on why this etext might be particularly difficult to use on the iPad? We have checked other etexts of ours an they all work fine andhave no timing out issues.
Thanks,
Lauren
Project Coordinator / Integrated Media Group / Pearson Australia
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(Msg # 1. : Posted Jan 18, 2012 9:47 pm)
by Erik Unhjem (Posts: 756) (IP: 184.8.247.124)
Hi Lauren,
The slow performance you're experiencing with the iPad view of your Campbell Biology eText is a direct result of the artwork and how it was created.
During ingestion, the Content Manager generates a set of lowerresolution (150 dpi) iPad PDFs from the original hires (300 dpi) source PDFs that are used tocreate the SWFs used in the online view. Unless the optional "Process from Optimized" is selected, those lowerres iPad PDFs are faithful copies of the source files,with all of the elements intact.
The problem with the Campbell files is that many of the pages have a lot of elements, and every one of them has been included in the iPad PDFs.
While the artwork on page 335, for example, looks relatively simple, it's not. Here are sidebyside views of the PDF, showing the artwork as you see it, and how itlooks like using PitStop's wire frame view:
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This is a classic example of what we refer to as "intense vector graphics", which use vectorbased gradient or radial fills, rather than a rasterbased image, such asyou'd have using Photoshop. Looking at the same artwork with PitStop (a powerful Acrobat plugin), you can see that the relatively innocuous artwork contains 6451paths, along with 38 clipping paths (or masks) and 22 shadings:
While page 335 is one of the larger iPad PDF files at 772K, it's only half the size of the largest, which is the PDF for page 464. Looking at the construction of the mapartwork using PitStop's wire frame view shows that the artwork is actually pretty complicated:
Some of the more complicated artwork in a section of this map is actually hidden by an overlapping photo:
At least some of this could have been avoided by selecting "Process from Optimized" selection during ingestion. This optional step rasterizes intense vectorgraphics, such as in these illustrations, which would likely make the overall file size considerably smaller and therefore provide a better customer experience for theiPad view. The eText optimization routine also resolves many of the rendering issues frequently encountered with the various effects that can be applied duringpage construction with InDesign.
You can probably improve the customer experience by having at least the pages with larger iPad PDF file sizes reingested with the optional "Process fromOptimized" selected.
Regards,
Erik
eText Systems Product Manager
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