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Archived Message:

ebook size


 
TerryJ I have compiled my first ebook with Activ EBook and it has compiled to a size of just over 500k from a total file size of 54K. Would this be considered normal or do you think I have done something wrong.

I ask because I have compiled the same ebook using another compiler and it compiled to a size of 290K. I haven't finished the ebook yet (I was playing with the compile time variables and wanted to see if I was doing it properly) so I am concerned at what the final file size will be especially considering the amount of gifs (screen shots) I was planning to use.

I would rather use Activ EBook but a ratio of 10 to 1 is getting rather high and doesnt seem right.

Any help or advice would be appreciated ... Thanks

TJ


Posted on: 11:48 am on April 30, 2002
EBookCompiler The ebook consists of several parts

1. A fixed amount of overhead for the viewer code.  About 480K in version 4.01, and about 410K in version 4.22

2. In 4.22 only, the toolbar and language data, should be <10K (compressed)

3. Your splash screen if present, compressed

4. The settings for the ebook, like the title, passwords etc.,  This should not be too much (a few K probably)

5. The content.  Compressed.  HTML files compress very well, GIF and JPEGs not very well.  HTML code might compress to around 25% of the original size.

Add these up, and you probably get an idea of why your ebook seems so large, it's the fixed overheads

500K is probably (I'm guessing for your ebook as I don't know the exact figures), 485K or so of overhead, and 15K of compressed content (the 54K compressed)

If you have say 1000K of content, and it compresses, you'll probably find with Activ, assuming similar type of compression ratio, it's 485K + 250K (25% of 1000K) = 735K ebook

etc.

Couple of differences from most of Activ's competitors
(I am going to try and avoid naming specific ones, as I don't spend my days tracking each one individually, so forgive me for using broad generalizations)

1. I suspect our overhead might be larger than some competitors.  The reason for this is they compress their viewer code.  We don't.  There is a good reason why we don't -- if you compress the viewer code it causes compatibility problems with some anti-virus products.  Personally, I think an extra 100K or so on downloads in the overhead is a small price to pay to know your ebook will work regardless of which anti-virus product your customers have.

2. We compress the content, and pretty well I think.  Some of our competitors don't.  What this means is if you have a lot of content in your ebook, Activ will usually make a smaller ebook

Finally go look at the Q+A on ebook size in the reference section of the Help.  This has some tips on helping keep the size as small as possible.

HTH


Posted on: 2:55 pm on April 30, 2002
TerryJ Thanks Sunil,

That has helped. It has basically told me that my file won't increase proportionally (ie 10 to 1) because the majority of the file so far is overhead which shouldn't increase that much more.

I already read the Q + A and that is why I was experimenting with the compile time variables, it did reduce the file slightly, but as I add more pages and repeat some of those variables I hope to see more of a difference. I have also used GIFcruncher and it managed to reduce the GIF's by 25% (I did this after my first post). Thanks for your help.

TJ


Posted on: 3:21 pm on April 30, 2002

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